{"id":4179,"date":"2025-05-17T06:36:13","date_gmt":"2025-05-17T06:36:13","guid":{"rendered":"https:\/\/zelinbio.com\/?p=4179"},"modified":"2025-05-17T06:36:13","modified_gmt":"2025-05-17T06:36:13","slug":"10-big-mistakes-when-dyeing-hair-and-how-long-to-leave-hair-dye-in","status":"publish","type":"post","link":"https:\/\/zelinbio.com\/fr\/10-big-mistakes-when-dyeing-hair-and-how-long-to-leave-hair-dye-in\/","title":{"rendered":"10 Big Mistakes When Dyeing Hair (And How Long to Leave Hair Dye In)"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Thinking about coloring your hair at home? It&#8217;s a great way to save time and money, especially if you can&#8217;t get to the salon. But dyeing your hair at home can sometimes go wrong, particularly if it&#8217;s your first time. Want to know <\/span><b>how long to leave hair dye in<\/b><span style=\"font-weight: 400;\"> and avoid a hair disaster? Keep reading to learn about common mistakes and how to get the color you want.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Here are some of the biggest mistakes people make when dyeing their hair:<\/span><\/p>\n<p><b>1) Picking the Wrong Hair Color<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Getting the color right starts with choosing the right dye. Different types of hair dye do different things.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>New to dyeing?<\/b><span style=\"font-weight: 400;\"> Try a semi-permanent or temporary color first. These wash out after a few shampoos (usually 4-20). So, if you make a mistake, it won\u2019t last forever.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Thinking of a big change?<\/b><span style=\"font-weight: 400;\"> It&#8217;s probably best to wait for a hairdresser. Home dyeing isn&#8217;t the best for drastic changes.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Got enough dye?<\/b><span style=\"font-weight: 400;\"> If your hair is shoulder-length or longer, or if it&#8217;s thick, you&#8217;ll likely need at least two boxes to cover all your hair.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Drugstore vs. Salon color:<\/b><span style=\"font-weight: 400;\"> We don&#8217;t recommend drugstore dyes. They can be harsh and damage your hair. Salon-quality color (hairdressing color) is gentler, and the results are usually better and last longer. Think of it like off-the-rack clothes versus a custom-made outfit \u2013 the custom one is better quality and fits you perfectly.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Choosing the right shade:<\/b><span style=\"font-weight: 400;\"> If it&#8217;s your first time, pick a color that&#8217;s no more than two shades darker or lighter than your natural hair. If you&#8217;re stuck between two shades, go for the lighter one.<\/span><\/li>\n<\/ul>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-4181\" src=\"https:\/\/zelinbio.com\/wp-content\/uploads\/2025\/05\/0_0-1.png\" alt=\"High-fashion blonde female model in a professional photo studio, close-up portrait. Long straight blonde hair, no makeup, smooth glass-like glossy skin with hyperrealistic texture. Iridescent purple shadows softly reflecting on her skin, like a pearlescent glow. Clean background, soft natural lighting, cinematic style, ultra high definition, Vogue editorial look. ultra-detailed, cinematic lighting, 4K, sharp focus, high fashion.\" width=\"1456\" height=\"816\" srcset=\"https:\/\/zelinbio.com\/wp-content\/uploads\/2025\/05\/0_0-1.png 1456w, https:\/\/zelinbio.com\/wp-content\/uploads\/2025\/05\/0_0-1-300x168.png 300w, https:\/\/zelinbio.com\/wp-content\/uploads\/2025\/05\/0_0-1-1024x574.png 1024w, https:\/\/zelinbio.com\/wp-content\/uploads\/2025\/05\/0_0-1-768x430.png 768w, https:\/\/zelinbio.com\/wp-content\/uploads\/2025\/05\/0_0-1-18x10.png 18w, https:\/\/zelinbio.com\/wp-content\/uploads\/2025\/05\/0_0-1-600x336.png 600w\" sizes=\"(max-width: 1456px) 100vw, 1456px\" \/><\/p>\n<p><b>2) Using the Wrong Developer<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Another common mistake is using the wrong developer (the liquid you mix with the color). Using a developer from a different brand or a different product line can mess up your color, making it uneven or blotchy.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Always use the recommended developer:<\/b><span style=\"font-weight: 400;\"> Mix your hair color only with the developer that&#8217;s made for it. This helps you get the color you expect.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Developer strength matters:<\/b><span style=\"font-weight: 400;\"> The power of the developer is important. The most common one is 6% (or 20 volume), which works well for dyeing, lightening a bit, and covering gray hair. For bright red shades, a stronger 9% (or 30 volume) developer can give you a more vibrant color. But these are just general rules. The best developer also depends on the type of dye, how much lighter you want to go, and your hair type and condition.<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><b>3) Washing Your Hair Right Before Dyeing<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Don&#8217;t wash your hair immediately before coloring it.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Why?<\/b><span style=\"font-weight: 400;\"> Hair that hasn&#8217;t been washed for 1-2 days has a natural protective layer on the scalp. This helps prevent irritation from the dye, and the color can stick better.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Avoid styling products:<\/b><span style=\"font-weight: 400;\"> Also, don&#8217;t use things like dry shampoo, hairspray, or gels right before dyeing. If you use purple or silver shampoo, stop using it at least a week before you color. These products can stop the dye from soaking into your hair properly.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Tip!<\/b><span style=\"font-weight: 400;\"> You can use a deep cleansing shampoo 1-2 days <\/span><i><span style=\"font-weight: 400;\">before<\/span><\/i><span style=\"font-weight: 400;\"> you plan to dye your hair to get rid of any product buildup.<\/span><\/li>\n<\/ul>\n<p><b>4) Guessing the Mixing Amounts<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Don&#8217;t just eyeball how much color and developer to mix. There&#8217;s a reason manufacturers give detailed instructions!<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Follow instructions carefully:<\/b><span style=\"font-weight: 400;\"> Always measure the color and developer precisely as the instructions say.<\/span><\/li>\n<\/ul>\n<p><b>5) Using the Wrong Tools<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Believe it or not, your tools can affect your color.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>No metal!<\/b><span style=\"font-weight: 400;\"> Never mix or apply dye with metal bowls or tools. The metal can react with the dye and change the color in unexpected ways. Use plastic, porcelain, or glass bowls and tools instead.<\/span><\/li>\n<\/ul>\n<p><b>6) Skipping the Allergy and Strand Test<\/b><\/p>\n<p><span style=\"font-weight: 400;\">This is a really important step!<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Allergy test:<\/b><span style=\"font-weight: 400;\"> Do a skin allergy test 48 hours before you dye, every single time. Allergies can pop up suddenly, even if you&#8217;ve used that brand or another hair dye before. Put a small amount of the mixed dye on a patch of skin (like behind your ear or on your inner elbow). Leave it for 30 minutes, then rinse. If you don&#8217;t have any redness, itching, or irritation after 48 hours, you&#8217;re good to go.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Strand test:<\/b><span style=\"font-weight: 400;\"> Also, test the dye on a small, hidden strand of your hair. This shows you how the color will look on your hair and how your hair reacts to it. This is super important if you&#8217;re trying a new shade.<\/span><\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-3861\" src=\"https:\/\/zelinbio.com\/wp-content\/uploads\/2024\/12\/hins0811_httpss.mj_.run18AFxVLpWG0_real_before_and_after_of_a__3ae4d485-a41b-418c-b278-63811945ab3a_3.png\" alt=\"real before and after of a hair transformation. Photo is taken at the salon by the hairstylist. Photos are side by side of a girl with dry blonde hair that got transformed to beautiful hot pink and light pastel peach hair. Hair in the after photo was styled like a Vogue magazine editorial\" width=\"1456\" height=\"816\" srcset=\"https:\/\/zelinbio.com\/wp-content\/uploads\/2024\/12\/hins0811_httpss.mj_.run18AFxVLpWG0_real_before_and_after_of_a__3ae4d485-a41b-418c-b278-63811945ab3a_3.png 1456w, https:\/\/zelinbio.com\/wp-content\/uploads\/2024\/12\/hins0811_httpss.mj_.run18AFxVLpWG0_real_before_and_after_of_a__3ae4d485-a41b-418c-b278-63811945ab3a_3-300x168.png 300w, https:\/\/zelinbio.com\/wp-content\/uploads\/2024\/12\/hins0811_httpss.mj_.run18AFxVLpWG0_real_before_and_after_of_a__3ae4d485-a41b-418c-b278-63811945ab3a_3-1024x574.png 1024w, https:\/\/zelinbio.com\/wp-content\/uploads\/2024\/12\/hins0811_httpss.mj_.run18AFxVLpWG0_real_before_and_after_of_a__3ae4d485-a41b-418c-b278-63811945ab3a_3-768x430.png 768w, https:\/\/zelinbio.com\/wp-content\/uploads\/2024\/12\/hins0811_httpss.mj_.run18AFxVLpWG0_real_before_and_after_of_a__3ae4d485-a41b-418c-b278-63811945ab3a_3-18x10.png 18w, https:\/\/zelinbio.com\/wp-content\/uploads\/2024\/12\/hins0811_httpss.mj_.run18AFxVLpWG0_real_before_and_after_of_a__3ae4d485-a41b-418c-b278-63811945ab3a_3-600x336.png 600w\" sizes=\"(max-width: 1456px) 100vw, 1456px\" \/><\/p>\n<p><b>7) Not Applying the Dye Correctly<\/b><\/p>\n<p><span style=\"font-weight: 400;\">If you just slap the dye on randomly, you&#8217;ll likely get an uneven color.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Work in sections:<\/b><span style=\"font-weight: 400;\"> Apply the dye systematically, section by section, strand by strand. This helps make sure all your hair gets covered evenly. Pros often divide hair into four sections: down the middle, and then from ear to ear over the top.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Where to start:<\/b><span style=\"font-weight: 400;\"> Most of the time, you&#8217;ll start applying color at the back (nape of the neck), then move up to the crown, and then to the front hairline. Always apply to new hair growth (roots) first, then the middle parts of your hair, and finally the ends. Hair around your face is often more porous or damaged and can soak up color faster.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Application can vary:<\/b><span style=\"font-weight: 400;\"> The way you apply dye can change depending on if your hair is virgin (never colored), already colored, or gray.<\/span><\/li>\n<\/ul>\n<p><b>8) Getting the Processing Time Wrong (How Long to Leave Hair Dye In)<\/b><\/p>\n<p><span style=\"font-weight: 400;\">It&#8217;s crucial not to leave the dye on for too long or wash it out too soon. This is where knowing <\/span><b>how long to leave hair dye in<\/b><span style=\"font-weight: 400;\"> is key.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Follow instructions:<\/b><span style=\"font-weight: 400;\"> Always follow the timing instructions from the manufacturer. Some dyes are strong and can damage your hair if left on too long.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Too short?<\/b><span style=\"font-weight: 400;\"> If you rinse it out too early, the color won&#8217;t develop properly. The usual time is around 35-40 minutes. The question of <\/span><b>how long to leave hair dye in<\/b><span style=\"font-weight: 400;\"> often comes down to these manufacturer guidelines for best results.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>What happens during processing:<\/b><span style=\"font-weight: 400;\"> In the first 15 minutes, ammonia in the dye opens up the hair so the color can get in. Between 15-30 minutes, your hair takes on the new color. In the last 5-10 minutes, conditioners and protective ingredients in the dye get to work.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>It depends on your hair:<\/b><span style=\"font-weight: 400;\"> The perfect processing time also depends on your hair&#8217;s texture (fine, medium, coarse), thickness, and length. Figuring out <\/span><b>how long to leave hair dye in<\/b><span style=\"font-weight: 400;\"> might need slight adjustments based on these factors, but always stay within the recommended range.<\/span><\/li>\n<\/ul>\n<p><b>9) Not Rinsing the Color Out Properly<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Rinse your hair really well after the developing time is up.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Rinse until water is clear:<\/b><span style=\"font-weight: 400;\"> Don&#8217;t rush this step. Keep rinsing until the water running off your hair is completely clear. If it&#8217;s even a little bit colored, keep rinsing.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Shampoo and conditioner:<\/b><span style=\"font-weight: 400;\"> Then, use shampoo and conditioner as directed (sometimes you might skip shampoo \u2013 always check the dye instructions).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Wait to wash again:<\/b><span style=\"font-weight: 400;\"> Try to avoid washing your hair with shampoo for at least 2 days after dyeing. Things like chlorine and minerals in tap water can cause the outer layer of your hair to lift, making the color fade faster. Waiting gives the dye more time to really soak into your hair. If you wash it too soon, your color might not be as vibrant.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Oily hair?<\/b><span style=\"font-weight: 400;\"> Use dry shampoo if you need to, but try to wait to wet-wash it.<\/span><\/li>\n<\/ul>\n<p><b>10) Skipping After-Color Treatment<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Don&#8217;t forget to care for your hair after coloring.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Neutralize and stabilize:<\/b><span style=\"font-weight: 400;\"> Use a special &#8220;Color Post Treatment&#8221; product if one comes with your dye or if recommended. This helps stop the chemical process and seals in the color.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Use color-safe products:<\/b><span style=\"font-weight: 400;\"> The right shampoo and <a href=\"https:\/\/zelinbio.com\/fr\/product\/botanical-extracts-conditioner\/\">conditioner<\/a> can also help your color last longer and prevent fading. Look for products that say &#8220;color protect,&#8221; &#8220;color-preserving,&#8221; or &#8220;for colored hair.&#8221; These usually have gentler cleaners.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Avoid sulfates:<\/b><span style=\"font-weight: 400;\"> Sulfates can strip oils from your hair and scalp, which can make your color fade faster.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Avoid harsh shampoos:<\/b><span style=\"font-weight: 400;\"> Also, stay away from deep cleansing shampoos and anti-dandruff shampoos right after coloring, as they can be too strong for freshly colored hair.<\/span><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Thinking about coloring your hair at home? It&#8217;s a great way to save time and money, especially if you can&#8217;t get to the salon. But dyeing your hair at home can sometimes go wrong, particularly if it&#8217;s your first time. Want to know how long to leave hair dye in and avoid a hair disaster? [&hellip;]<\/p>","protected":false},"author":1,"featured_media":3743,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[42,44],"tags":[128,58],"class_list":["post-4179","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-hair-dye","tag-hair-color-manufacturer","tag-hair-dye-products"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.4 (Yoast SEO v26.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>10 Big Mistakes When Dyeing Hair (And How Long to Leave Hair Dye In)<\/title>\n<meta name=\"description\" content=\"dyeing your hair at home? 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