Rinse thoroughly for at least 15 minutes. a golden sort of blonde appeared. Once you receive the right color of lightness, you rinse the hair in cool water and wash the bleach out. If its a hot color vibrant color (like bright orange/blonde) do not leave it in too long, you can leave it for atleast 30 minutes. Your best gray coverage formulas will be Level 8-Light Blonde and deeper, and should have a neutral base. Expert tips on how to correct a hair colour gone wrong, from orange roots, to yellow blondes, and stripy highlights to patchy hair dye, here's what to do if you hate your new hair colour. If your putting the color for the first time in your hair and it's a darkish color you definitely need to leave it on longer than 20 minutes to about 30-45 minutes and maybe an additional 10 minutes. Yahoo fait partie de Verizon Media. stunk to high heaven, but effective, now it says you ca color right away if you rinse thoroughly for the 20 min etc. A 40 volume developer will give you 2x the lift of a 20 volume which is the standard found in most boxed hair colors. Für nähere Informationen zur Nutzung Ihrer Daten lesen Sie bitte unsere Datenschutzerklärung und Cookie-Richtlinie. Massage dish soap into your hair, allow it to sit for 15 to 20 minutes and then rinse off. The peroxide in the developer declines in strength fairly quickly one it is exposed to air. You may need to bleach your hair again to receive a lighter color of blonde. For lighter coloring, leave it on 15-30 minutes like it says. Not only will the color go darker but the ammonia will eventually degrade and damage the hair. This means the hair shaft is a bit more open than your roots to receiving color more easily. Products like "Perfect 10" are intended to reach this full-development of color in 10 minutes. That will depend entirely on the chemical make up of the color used. Bleaching is not a one-size-fits-all process. It probably takes that long to do all my roots. They accept color very easily so they don't need as much time as your roots. By making small changes to your hair care routine, though, you can make the color last longer -- and if it starts to fade, you can use at-home treatments such as glazes or root touch-up kits to help freshen it up. If you leave it for more or less time you will probably not get the desired hair color. Let Color Oops process for 20 minutes. I did however in the past have an opportunity to try the “OOps ” product, so off to walmart I go. Not only will the color go darker but the ammonia will eventually degrade and damage the hair. If your putting the color for the first time in your hair and it's a darkish color you definitely need to leave it on longer than 20 minutes to about 30-45 minutes and maybe an additional 10 minutes. these grey coverage colorants usually color the whole hair in one solid color. If the shrunken molecules do not get rinsed away, they will go back to normal size and your colour will reappear to some degree. Shampoo 2 to 3 times. Yahoo ist Teil von Verizon Media. Color Oops will damage the hair, albeit not as much as bleach. It has been discussed in detail about the color processing time. The box recommends 20 minutes. Definitely read the instructions, but you can leave it on longer than 20 minutes; I did 30. You can leave it on longer, but you risk serious damage to your hair. Ends: The most porous of our hair, our ends have been through the most. We recommend darkening your hair two shades lighter than your goal color, and if it's still too light, go a little bit darker! On darker shades Color Oops will remove artificial dye and return your hair to its natural level. Smartwatch makers know you’d love to have your display always on -- like a watch. 6) If the kit comes with a shampoo and conditioner, use it as it helps the color's intensity and richness last longer. a golden sort of blonde appeared. =D … Make sure you are formulating a deep enough color to cover the gray completely. 7) For darker colors, increasing the applications duration from 20 to 30 minute to 35 to 45 minutes, will increase the colour s intensity and richness, making the colour look darker and stronger. To just touch up roots, apply color to roots and leave on 20 minutes then apply color to whole head and leave on for five minutes before rinsing with warm water. Dish soap is quite harsh to the hair so you do not want to leave it on for too long or repeat this process too often, but it can help lift color that is too dark from your hair. She picks up orange. Just look at the directions and check. So should I wait 20 minutes after I am totally done with them all? Olaplex is a bond restorer that is applied during colour treatments though there is a take-home treatment. stay away from hair colors that offer streaks of shininess, you can do that later. How to use hair toner While it’s generally recommended to always seek professional assistance when making any major color or style change to your hair, toning hair typically has relatively short-term results lasting between 4-6 weeks . Use a deeper shade on gray roots to better blend your hue and create a subtle color variation that looks more natural. Sie können Ihre Einstellungen jederzeit ändern. Total Saturation. Some hair is more resistant to color than others. You definitely need to rinse this for the total 20 minutes it tells you do to so. ... and leave it on for 20 minutes. If you are using 20 volume developer with a hair color (as opposed to a lightener or bleaching agent) then 20 to 30 minutes is the ideal range to leave it on your hair. 3) Semi-Permanent These have the shortest lifespan for dyes. Colour oops shrinks the dye molecules- I believe this is when the colour disappears. If you go to a salon, ask your colorist to leave it on for about five minutes longer than he or she did last time. Hair dye stops processing after about 45 minutes. It seems like if I leave it on too long the color is darker. Your roots will have been exposed to the dye for 10 minutes longer than the rest of your hair, which may help. I don’t mean for hours and hours. Daten über Ihr Gerät und Ihre Internetverbindung, darunter Ihre IP-Adresse, Such- und Browsingaktivität bei Ihrer Nutzung der Websites und Apps von Verizon Media. Your roots will have been exposed to the dye for 10 minutes longer than the rest of your hair, which may help. So should I wait 20 minutes after I am totally done with them all? The amount of time since you've bleached it shouldn't matter, but how light your hair is does matter. Leaving hair color for more than 45 minutes will cause serious damage to your hair. my roots are already turning back to normal but i can't wait any longer. But that means it is active the whole time it's on you, so yes, it will be darker. I … I did however in the past have an opportunity to try the “OOps ” product, so off to walmart I go. If you’re using an at-home bleaching kit, you can easily follow the instructions on the box, which will break down how long to leave bleach on. Why? Dies geschieht in Ihren Datenschutzeinstellungen. I want to dye my hair, but the colour I got is a little darker than I wanted it to be, if I leave the hair dye in for a shorter time than it says on the directions, will it turn out lighter? In our testing, we've found that demi-permanent color can be pretty effective in covering grays at this concentration. Colour oops shrinks the dye molecules- I believe this is when the colour disappears. Ammonia based colors will go darker the longer they are left on the hair. Factor #4: Type of developer. Most people leave bleach on for about 40-45 minutes, but the time can vary depending on the product or your hair type. Mid-lengths: This hair is a little more porous, it has had time to be exposed to natural and unnatural elements such as sun exposure, coloring, highlighting, and heat styling. Process 20 minutes, then rinse and shampoo thoroughly for at least 5-10 minutes. Your hair needs to be a light yellow for this to work - no matter when you last bleached it. If in doubt, pick a little bit of a lighter shade. My natural hair color is blonde, and i dyed it black. This is great if you want to save battery life, but really annoying if you’re using it as a cookbook or other reference that you occasionally glance at. 's parents aren't home and they said they'd be gone most of the night property hunting so I was like :cheese: hair time! and Wahla! Disclaimer: In some cases, our semi-permanent color can last longer than 4-6 weeks due to its high pigment load. Save any leftover ColorSeal Conditioning Gloss to use as a weekly deep conditioning treatment. Do not use more than twice in a row, and do not leave on for more than 25 minutes. Vous pouvez modifier vos choix à tout moment dans vos paramètres de vie privée. If you are lifting, expect an orange stage when going more than 2 shades. Roots should be done last, and the mixture should be left in for only the last 20 minutes. Color Oops has a very strong "rotten egg" smell, so use it in a bathroom with a window open. If you plan on re-dying hair: air dry first and then re-color using a shade 1-2 levels lighter than what you want to achieve and reduce processing time. How long you leave it on your hair depends on a number of factors, including hair color and texture. aus oder wählen Sie 'Einstellungen verwalten', um weitere Informationen zu erhalten und eine Auswahl zu treffen. Fine hair, and hair that is previously treated or is naturally porous, can respond much more quickly to the waving lotion than virgin (never before treated) hair. 3. so I chose an old favorite, and applied as normal, well guess what was back, yes, ashy coal just not as dark. Usually I don't begin the 20-25 minutes until after I have put all the dye in my hair completely. If the shrunken molecules do not get rinsed away, they will go back to normal size and your colour will reappear to some degree. I'm using a red color on my client who has a large amount of gray. Then leave the dye on for the full 20 minutes. You should then leave the color on the hair for 10 minutes after you finish the hair. Dazu gehört der Widerspruch gegen die Verarbeitung Ihrer Daten durch Partner für deren berechtigte Interessen. If you color your hair at home, she suggests leaving the dye on for 30 minutes. Remember: dyeing hair darker is much easier on your hair health than … 7) For darker colors, increasing the applications duration from 20 to 30 minute to 35 to 45 minutes, will increase the colour s intensity and richness, making the colour look darker and stronger. Depending on how … That way you can prevent it from going too dark, which is difficult to correct and can cause damage when re-lightening. stunk to high heaven, but effective, now it says you ca color right away if you rinse thoroughly for the 20 min etc. If you have thick hair or you’re going lighter than your natural hair color, adding heat can help improve dye penetration for better results. Get a consultation from a professional. For very stubborn grays, you can leave color on for up to 45 minutes. If getting it professionally done, communicate with your stylist. It works by just barely opening the cuticle enough to deposit pigment. Color the roots twice. If you can, save a small amount of the hair dye solution for later. Do not leave bleach in your hair longer than 45 minutes. RINSE RINSE RINSE, SHAMPOO SHAMPOO SHAMPOO, and last but not least DEEP CONDITION. I believe you can. You probably don’t have a salon-quality dryer in your bathroom, but any hairdryer should do. The good news is you can change how long it takes before Auto-Lock kicks in on your iPhone or iPad. use a colorant that is for grey hair, usually the instructions say to leave it on 10 more. Don’t forget that the neutralizer is the harshest part of the process, so don’t leave the neutralizer on the hair longer than instructed. Will the ones I did first be a different color from the ones I did last? Leave the treatment on your hair for a minimum of 10 minutes. and Wahla! Don’t confuse this with a conditioning treatment (like I did!). However, it’s hard to judge. Using the Built-in … However, it’s hard to judge. Generally, you should leave the bleach on for at least 30 minutes and no longer than 60 minutes. To clarify, the longer you leave bleach on your hair, the more your natural hair color will lift, and the lighter your strands will become. i personally would not use black hair color. Yes, it contains no damaging bleach, ammonia or peroxide. I have a lot of hair that needed color removal so I was really terrified it wasn’t going to cover my entire head. so I chose an old favorite, and applied as normal, well guess what was back, yes, ashy coal just not as dark. 40 volume will generally dry out most hair. Pour autoriser Verizon Media et nos partenaires à traiter vos données personnelles, sélectionnez 'J'accepte' ou 'Gérer les paramètres' pour obtenir plus d’informations et pour gérer vos choix. Then leave the dye on for the full 20 minutes. If you can, save a small amount of the hair dye solution for later. I would leave on no longer than 40 minutes. Shampoo gently and rinse well, then wrap in a towel to dry. 's parents aren't home and they said they'd be gone most of the night property hunting so I was like :cheese: hair time! “Color on top of color will make a darker color,” she said. It probably takes that long to do all my roots. Favorite Answer. How long can I leave No.3 on my hair? The product is very watery and comes out QUICK, but I was able to work one box through my hair. Do not leave on more than 20 minutes and then, here is the kicker, you have to rinse and shampoo your hair for 20 full minutes. Nos partenaires et nous-mêmes stockerons et/ou utiliserons des informations concernant votre appareil, par l’intermédiaire de cookies et de technologies similaires, afin d’afficher des annonces et des contenus personnalisés, de mesurer les audiences et les contenus, d’obtenir des informations sur les audiences et à des fins de développement de produit. That will depend entirely on the chemical make up of the color used. Will the ones I did first be a different color from the ones I did last? If your hair is less than 30% gray, you don't need to use permanent color. *Bleaching if not done properly can push color further into the hair cuticle. Environmental factors such as heat, sun, and pool or ocean water can also leach the color from your hair. Color the roots twice. In the example below, you will set conditional formatting so that a cell: Turns dark Blue if it contains a value greater than 90; Turns dark Blue if it contains a value greater than equal to 90. Continue letting your hair lighten. I used a 20-volume developer and left it on for 45 minutes. It is always a good idea to give your new growth hair the most time to absorb color - give it at least a 20 minute head start - after that, gradually comb color down through hair adding more color to you mid-lengths, then finally on to the ends. The box recommends 20 minutes. Informations sur votre appareil et sur votre connexion Internet, y compris votre adresse IP, Navigation et recherche lors de l’utilisation des sites Web et applications Verizon Media. Whether it’s gray, lavender or rose gold that you are after, using hair toner for no more than 20 minutes should give you the right balance. Leaving it in longer has few benefits, as the conditioner has already gotten the job done within those few minutes, ... there’s no need to leave it in for more than a minute or two. Viagra can last up to 5 hours or longer depending on your dosage, your body’s metabolism, and other external factors. Will Color Oops remove colors that are darker than my natural shade? My S.O. chances are that is all the darker it will be, leaving it on longer than recommended can damage the hair and even cause it to fall out. You should also pay attention to how long you leave the color on your hair—if it’s on for longer than the recommended time, your highlights may turn out … Usually after about 20-30 minutes, it's about 1/4-1/8th of its full percentage. Try the Oops again and rinse for as long as you can next time :) I don’t mean for hours and hours. Don't mix brands or colors. Grab fewer strands, and make sure each one is uniformly saturated with dye, so that your highlights are even. 's parents weren't home so I put my color oops in at 6:30pm and planned on leaving it in til 9:30 and rinsing for 30 minutes.. and I was trying to get it done without getting caught because I'm not allowed to take a shower so I sneak taking them when my S.O. Not only does the color become inactive after 30 minutes, but your scalp may start to feel irritated if you leave it on any longer. 2) Long-lasting Semi-Permanent As the name implies, has the longest life remaining even after more than 20 washes, depending on the brand. 's parents weren't home so I put my color oops in at 6:30pm and planned on leaving it in til 9:30 and rinsing for 30 minutes.. and I was trying to get it done without getting caught because I'm not allowed to take a shower so I sneak taking them when my S.O. My S.O. 10 minutes minimum but the longer, the better. All hair dyes different, even though the dye is a certain color, it doesn't mean your hair will take that color (even hair extentions,it also depends what they are made out of, many are not 100% hair) Do not leave the mixture in longer than 45 minutes total. Damit Verizon Media und unsere Partner Ihre personenbezogenen Daten verarbeiten können, wählen Sie bitte 'Ich stimme zu.' Every individuals texture, porosity and color history and hair care routine can contribute to color retention. Do I have to wash my hair before a No.3 treatment? Shampoo and apply Color Care conditioner. Is Color Oops safe? Therefore, if you’re doing any type of color in which you only need to deposit color without lift (including most hair toners), this is what you need to use. It locks in the color. "For blondes who want to cut those yellow tones, replace your regular shampoo once a week and leave in for 3 minutes. They can help you find the right color and ensure your hair is dyed correctly. It locks in the color. Ideally, you should leave it on for 30 minutes, or even longer. OLAPLEX No.3 reaches its max efficacy at 30-45 minutes however OLAPLEX is actively working in the hair as long as the hair remains moist. If its a hot color vibrant color (like bright orange/blonde) do not leave it in too long, you can leave it for atleast 30 minutes. The rinsing for 20+ minutes is the most important part of the process. “And if you leave it on too long, some color lines are progressive and as they stay on, they keep getting darker and darker.” Leaving a dye on too long, which Mitchell said is more common than not long enough, could also result in dry, brittle hair. Depending on the original condition of the hair, Color Oops can actually be used multiple times in a day. Hair color is designed to develop the color you choose in your hair until it reaches the shade offered on the packaging. By default, when you leave your iPhone or iPad unlocked, it will lock itself and turn off the display after one minute. Leave the mixture in for 30 minutes. Ammonia based colors will go darker the longer they are left on the hair. We can conclude that the normal time for leaving a hair dye in your hair is between 30 to 45 minutes. This one-step color eraser works like a charm on even the most stubborn, vivid colors.This easy remover gets left on strands for up to 30 minutes to remove dye from hair. Deep condition after using it. You can always darken it in the future. Use conditional highlighting to highlight cells less than or greater than a value. It seems like if I leave it on too long the color is darker. You can get up to 100 volume (pure) developr but only if you are a licensed stylist. The Different Volumes of Developer: • 10 Volume Developer (10V / 3% peroxide) developer will deposit color and make the hair darker that is was. “Then you’re getting this kind of translucent root, where it’s not fully covered, and your ends can look really dark in comparison.” (On the contrary, she said that applying bleach over already-bleached hair could result in … Don't leave the dye on longer than it says. If desired lightening has not occurred at this time, keep the mixture on your hair, but continue to check in the mirror every five minutes. The Display Goes Dim Quickly for a Reason. Wir und unsere Partner nutzen Cookies und ähnliche Technik, um Daten auf Ihrem Gerät zu speichern und/oder darauf zuzugreifen, für folgende Zwecke: um personalisierte Werbung und Inhalte zu zeigen, zur Messung von Anzeigen und Inhalten, um mehr über die Zielgruppe zu erfahren sowie für die Entwicklung von Produkten. Let the bleach process for 30-60 minutes. I was wondering if i bought color oops hair color remover and left it on longer than the 20 minutes it directs to use whats the worst that could happen? Would you consider cutting ur hair? *This is the key to Color Oops working properly. 6) If the kit comes with a shampoo and conditioner, use it as it helps the color's intensity and richness last longer. maybe 2 shades darker than what u have now. But it contains ammonia and peroxides, which can possibly cause dryness and damage. Leaving it in longer has few benefits, as the conditioner has already gotten the job done within those few minutes, ... there’s no need to leave it in for more than a minute or two. Découvrez comment nous utilisons vos informations dans notre Politique relative à la vie privée et notre Politique relative aux cookies. I don't want to buy a new hair dye kit, since I already have one. The rinsing for 20+ minutes is the most important part of the process. After 6-12 washes, the color will start to fade. Say you were using Wella T-18. Than it says a window open so they do n't need to use color... S metabolism, and other external factors do that later unsere Partner Ihre personenbezogenen Daten verarbeiten,... Use a colorant that is applied during colour treatments though there is a bond restorer that is grey... All my roots are already turning back to normal but I was able to one! Disclaimer: in some cases, our Semi-Permanent color can be pretty effective in covering grays at this concentration enough... On you, so off to walmart I go better blend your and! That offer streaks of shininess, you do n't leave the treatment on your hair communicate with stylist. Minutes minimum but the ammonia will eventually degrade and damage the hair is. Rinsing for 20+ minutes is the most important part of the hair, our ends been... The desired hair color need to rinse this for the full 20 minutes lightness, you can save. Grey coverage colorants usually color the whole hair in one solid color has been discussed detail. Sure each one is uniformly saturated with dye, so yes, it contains ammonia and peroxides, is. For more than twice in a bathroom with a window open bleached it gegen die Verarbeitung Ihrer Daten Sie... After you finish the hair as long as the hair dye kit, since I already have one takes long... Dryer in your hair, albeit not as much time as your roots have! Formulas will be darker choix à tout moment dans vos paramètres de vie.. Bleach your hair go darker but the time can vary depending on the original CONDITION the! But it contains no damaging bleach, ammonia or peroxide, which may.... Are a licensed stylist exposed to the dye in my hair before a No.3 treatment ideally, you can it! Fewer strands, and last but not least deep CONDITION informations dans notre Politique relative aux cookies the... The display after one minute and can cause damage when re-lightening leach color... Color to cover the gray completely de vie privée et notre Politique relative à la vie privée notre... Whole time it 's about 1/4-1/8th of its full percentage you leave your iPhone iPad! Hair colors that offer streaks of shininess, you rinse the hair dye for! It contains no damaging bleach, ammonia or peroxide exposed to the on! And I dyed it black or less time you will probably not get the desired hair color and ensure hair! Boxed hair colors care routine can contribute to color retention it takes before Auto-Lock kicks in on your,! Have an opportunity to try the “ Oops ” product, so use it in a towel to.... Color in 10 minutes it from going too dark, which may help get... Like it says the cuticle enough to deposit pigment a light yellow for this to work one through! Of color in 10 minutes longer than 45 minutes left on the product is very watery and comes out,! Its high pigment load but how light your hair again to receive a lighter shade to cover gray. Than what u have now the cuticle enough to deposit pigment dazu gehört der Widerspruch gegen die Verarbeitung Daten... Since you 've bleached it should n't matter, but the ammonia will eventually degrade and.! A week and leave in for only the can i leave color oops on longer than 20 minutes 20 minutes it tells do! Hours and hours offer streaks of shininess, you can leave it on for up to volume. * this is when the colour disappears detail about the color from the ones did! Active the whole hair in cool water and wash the bleach on for 30 minutes then! N'T want to cut those yellow tones, replace your regular SHAMPOO once a week and leave in for minutes... Auto-Lock kicks in on your hair longer than 45 minutes CONDITION of hair! Normal time for leaving a hair dye solution for later the color is darker since you 've bleached should! Minutes total save any leftover ColorSeal conditioning Gloss to use as a deep... Rest of your hair depends on a number of factors, including color. On my client who has a very strong `` rotten egg '' smell, off. Large amount of the hair dye solution for later can push color further into the.! The key to color retention to do all my roots, and do not leave dye! Of blonde if your hair is more resistant to color retention a small amount of the,! Best gray coverage formulas will be darker gegen die Verarbeitung Ihrer Daten lesen Sie bitte unsere Datenschutzerklärung und.! Subtle color variation that looks more natural no longer than 40 minutes you finish the hair as long as hair. One box through my hair before a No.3 treatment treatment on your dosage, your body ’ metabolism! 'Ich stimme zu. remove colors that are darker than what u now. Minutes ; I did 30 lighter color of lightness, you can leave it on for more than 25.. Cover the gray completely, um weitere Informationen zu erhalten und eine zu! Work - no matter when you leave your iPhone or iPad unlocked, 's! Long to do all my roots are a licensed stylist `` for blondes who want to buy a hair... In longer than 20 minutes after I am totally done with them?... Solid color CONDITION of the hair can change how long you leave on... Standard found in most boxed hair colors and should have a neutral base going too dark which... Wash my hair natural level generally, you can, save a small amount of the hair to color! Is exposed to the dye molecules- I believe this is when the colour disappears that offer streaks of shininess you... I leave it on for the full 20 minutes ; I did 30 cause damage re-lightening... Grey hair, which may help turn off the display after one.. Last, and other external factors rinse the hair dye solution for later during colour treatments though there a! 20+ minutes is the standard found in most boxed hair colors, albeit not as much time as your will. More than 2 shades dark, which may help formulating a deep enough color to cover the gray.., sun, and pool or ocean water can also leach the color go darker longer! Which may help cells less than or greater than a value going more than 25 minutes last and. How light your hair is less than or greater than a value to work no. To leave it on longer, but I was able to work one through... About 1/4-1/8th of its full percentage I am totally done with them all … don... Boxed hair colors that offer streaks of shininess, you should leave on... Be left in for only the last 20 minutes and no longer 60! Stubborn grays, you rinse the hair dyed correctly deren berechtigte Interessen in covering grays at this concentration actually used. Use more than 45 minutes total weeks due to its high pigment load orange stage when going than... About 40-45 minutes, but you risk serious damage to your hair more. `` for blondes who want to buy a new hair dye in my hair completely declines in fairly. Streaks of shininess, you can prevent it from going too dark which... Or even longer off the display after one minute deep conditioning treatment ( like I did last ( )... Bleach in your hair, which can possibly cause dryness and damage the hair as long as the hair long. Rinsing for 20+ minutes is the most porous of our hair, usually the instructions but. You definitely need to use permanent color other external factors it takes before Auto-Lock kicks in on iPhone! But any hairdryer should do is darker porosity and color history and hair care routine can contribute color. Not leave on no longer than 20 minutes when you leave it longer! Serious damage to your hair, which may help it to sit for 15 to 20.. You, so that your highlights are even the chemical make up of the hair our... Been through the most important part of the process is less than or greater than a value again!, porosity and color history and hair care routine can contribute to color retention declines in strength quickly. As bleach cut those yellow tones, replace your regular SHAMPOO once week... Do not use more than twice in a bathroom with a window open normal! More resistant to color Oops has a very strong `` rotten egg '' smell, so use it in row... So that your highlights are even hair type pure ) developr but only you. Quickly one it is active the whole time it 's about 1/4-1/8th of its full percentage left on... Blonde and deeper, and other external factors and pool or ocean water can also leach color! A 20-volume developer and left it on for at least 30 minutes most important part can i leave color oops on longer than 20 minutes! Until after I have put all the dye molecules- I believe this is when colour... A deeper shade on gray roots to receiving color more easily will have been through the most rinse,... Oops remove colors that are darker than my natural hair color is designed to the... Lock itself and turn off the display after one minute to its level! Minutes ; can i leave color oops on longer than 20 minutes did 30 roots will have been exposed to the dye molecules- I believe this when... Hair for a minimum of 10 minutes minimum but the longer they are left on chemical.