{"id":7928,"date":"2026-10-02T19:05:22","date_gmt":"2026-10-02T17:05:22","guid":{"rendered":"https:\/\/xiaomoxuan.cz\/?p=7928"},"modified":"2026-10-04T10:18:50","modified_gmt":"2026-10-04T08:18:50","slug":"pece-o-barvene-vlasy","status":"publish","type":"post","link":"https:\/\/xiaomoxuan.cz\/en\/blog\/colour-treated-hair-care\/","title":{"rendered":"Coloured Hair Care: How to Make Your Colour Last as Long as Possible"},"content":{"rendered":"<p><\/p>\n<section>\n<p>For the first couple of weeks after the salon, your colour looks exactly the way you wanted it to. Then it starts: copper tones go dull, cool blonde turns yellow, and that rich chestnut becomes somehow \u201cnot quite right\u201d. Some of this is unavoidable \u2013 pigment gradually leaves the hair no matter how well you look after it. But how fast that happens depends on a handful of things you can actually control.<\/p>\n<p>Below: what really washes colour out, how often and with what water to wash coloured hair, and where real benefits end and label promises begin.<\/p>\n<\/section>\n<section>\n<h2>What fades hair dye the fastest<\/h2>\n<p><strong>In short:<\/strong> colour fades fastest because of hot water, harsh cleansing agents, chlorine, UV and minerals from hard water. Each of them either lifts the cuticle scales and lets pigment escape, or settles on the hair and dulls the colour from the outside.<\/p>\n<h3>Hot water<\/h3>\n<p>The cuticle is the outer layer of the hair, and it looks a bit like roof tiles. After dyeing it is already slightly raised: the dye had to get inside, and the chemicals opened the scales to let it in. Hot water opens them even further. Pigment escapes much more easily, especially in the first few weeks \u2013 you can often see it in the colour of the water when you rinse.<\/p>\n<p>Warm water is plenty to clean your scalp. Finish with a cool rinse through the lengths for about 20\u201330 seconds.<\/p>\n<p>  <img decoding=\"async\" src=\"https:\/\/xiaomoxuan.cz\/wp-content\/uploads\/2026\/10\/pece-o-barvene-vlasy-02-matne-vs-leskle.webp\" alt=\"Two strands of dyed hair side by side \u2013 one dull and porous, one smooth and glossy\" loading=\"lazy\" \/><\/p>\n<h3>Harsh cleansing agents<\/h3>\n<p>Shampoo is there to remove sebum, dust and product build-up. Strong surfactants do that very well \u2013 and take some of the pigment with them, along with the natural lipids that keep the cuticle tight. The more porous the hair (and after bleaching it almost always is), the faster it gives up its colour.<\/p>\n<p>We cover how to choose a shampoo for coloured hair and what to look for in the ingredients in a separate article \u2013 <a href=\"\/en\/expert-tips\/shampoo-for-colour-treated-hair-complete-guide\/\">shampoo for colour-treated hair: the complete guide<\/a>. Here we\u2019ll focus on what those guides usually leave out.<\/p>\n<h3>Hard water \u2013 the factor hardly anyone talks about<\/h3>\n<p>Hard water contains a lot of dissolved calcium and magnesium. When you wash, these minerals react with the cleansing agents, and some of them stay on the hair as a thin film. It builds up slowly, wash after wash, so it\u2019s easy to miss.<\/p>\n<p>What it looks like in practice:<\/p>\n<ul>\n<li>the colour looks flat even though the pigment is still in the hair \u2013 it\u2019s just \u201cdusted over\u201d;<\/li>\n<li>the lengths feel rough and dry even after a mask;<\/li>\n<li>light hair picks up a yellowish or greenish tint \u2013 if the water carries iron or copper from old pipes;<\/li>\n<li>hair absorbs care products less well, because they sit on a mineral film instead of the cuticle.<\/li>\n<\/ul>\n<p>If you\u2019ve moved and noticed your hair behaving differently with exactly the same products, the water is very often the reason. You can usually find the water hardness for your area on your local water supplier\u2019s website.<\/p>\n<p>What to do about it:<\/p>\n<ul>\n<li><strong>A shower filter.<\/strong> To be upfront: most inexpensive filters are good at removing chlorine but much less effective with calcium and magnesium. Before you buy, check what the manufacturer actually claims \u2013 water softening, or just chlorine removal.<\/li>\n<li><strong>A final rinse with soft water.<\/strong> Filtered, or boiled and cooled water \u2013 only for the last rinse of the lengths. It sounds like a hassle, but it\u2019s one litre and half a minute.<\/li>\n<li><strong>An acidic rinse.<\/strong> A tablespoon of apple cider vinegar in a litre of water once a week helps dissolve some of the deposits and smooth the cuticle. Not more often than that \u2013 it will dry the hair out.<\/li>\n<li><strong>Deep cleansing \u2013 with care.<\/strong> Clarifying shampoos remove mineral build-up, but they also strip colour faster than regular ones. For coloured hair, no more than once every 2\u20133 weeks, and always follow with a mask.<\/li>\n<\/ul>\n<p>  <img decoding=\"async\" src=\"https:\/\/xiaomoxuan.cz\/wp-content\/uploads\/2026\/10\/pece-o-barvene-vlasy-03-tvrda-voda-filtr.webp\" alt=\"Shower head with a filter and limescale on the tap \u2013 hard water and coloured hair\" loading=\"lazy\" \/><\/p>\n<h3>Chlorine and UV<\/h3>\n<p>More on these below, in the section on sun and pools. Just one note here: together with hard water, these are three factors that act at the same time and make each other worse.<\/p>\n<\/section>\n<section>\n<h2>How often to wash coloured hair, and with what water<\/h2>\n<p>Wait at least 48\u201372 hours after dyeing before the first wash. That gives the cuticle time to close and the pigment time to settle into the fibre. Wash the very next morning, and you\u2019ll simply rinse some of that fresh colour down the drain.<\/p>\n<p>After that, roughly 2\u20133 times a week. Every wash takes a little pigment with it, so the less often, the better for your colour. If your scalp gets oily quickly, you can wash just the roots and skip shampooing the lengths \u2013 the lather running down will clean them anyway.<\/p>\n<p>Water temperature \u2013 warm, not hot. Final rinse \u2013 cool. Don\u2019t rub your hair with a towel; gently squeeze it instead. Wet cuticle is especially vulnerable, and friction lifts the scales just like hot water does.<\/p>\n<p>  <img decoding=\"async\" src=\"https:\/\/xiaomoxuan.cz\/wp-content\/uploads\/2026\/10\/pece-o-barvene-vlasy-04-rucnik.webp\" alt=\"Woman gently squeezing her coloured hair with a towel after washing, without rubbing\" loading=\"lazy\" \/><br \/>\n<\/section>\n<section>\n<h2>Caring for the lengths after colouring<\/h2>\n<p>Colouring is a chemical treatment, even when the dye is labelled \u201cgentle\u201d. Afterwards the hair is more porous: the cuticle has more micro-damage, it loses moisture faster and holds colour less well. The conditioner in the dye kit is meant for a single use. From then on, the lengths need regular care that fills in that damage.<\/p>\n<p>This is where hydrolysed collagen works well. Its molecules are broken down into short peptides, so they settle on the surface of the hair and partly penetrate the cuticle, filling in damaged areas. The cuticle lies flatter \u2013 hair breaks less, detangles more easily, and the colour looks deeper, because light reflects off a smooth surface instead of scattering.<\/p>\n<p>Let\u2019s be clear about what collagen won\u2019t do: it won\u2019t return your hair to its pre-colour state, and it won\u2019t rebuild chemically broken bonds. The effect builds up over time \u2013 the first changes usually show after 2\u20133 weeks of regular use.<\/p>\n<p>Apply the mask 1\u20132 times a week to damp, lightly squeezed lengths, keeping away from the roots. Leave it on for as long as the packaging says. If your hair is bleached, it\u2019s worth reading about <a href=\"\/en\/blog\/hair-recovery-after-bleaching\/\">repairing hair after bleaching<\/a> too \u2013 the care there is a little different.<\/p>\n<p>  <img decoding=\"async\" src=\"https:\/\/xiaomoxuan.cz\/wp-content\/uploads\/2026\/10\/maska-dlya-poshkodzhenogo-volossya-hero.webp\" alt=\"Applying a collagen mask to damp coloured hair lengths, keeping away from the roots\" loading=\"lazy\" \/><\/p>\n<div class=\"cta-container\">\n<p class=\"cta-title\"><strong>Xiaomoxuan Collagen Hair Mask 550 ml<\/strong><\/p>\n<p class=\"cta-text\">Hydrolysed collagen for porous, colour-treated lengths: less breakage, easier detangling. Delivery across the EU.<\/p>\n<p>    <a href=\"\/en\/produkt\/ua-maska-z-kolagenom-550-ml\/\" class=\"cta-button-green\">View the mask \u2192<\/a>\n  <\/div>\n<\/section>\n<section>\n<h2>Sun, chlorine and sea water: protecting your colour in summer<\/h2>\n<p>UV oxidises pigment \u2013 both artificial and natural. Coloured hair fades noticeably faster in the sun: after a few weeks of strong sunshine, a cool shade can turn warmer and a dark one can lighten by half a tone. The simplest protection is a hat whenever you\u2019re out in the sun for a long time. Leave-in products with UV filters help too, but you need to reapply them after swimming.<\/p>\n<p>Pool chlorine opens the cuticle and dries hair out, and it can give light shades a greenish tinge. A trick that really works: wet your hair with clean shower water before getting in the pool. Hair that\u2019s already full of water soaks up less of the chlorinated kind. Rinse straight after swimming.<\/p>\n<p>Sea salt dehydrates the lengths, so after the beach it\u2019s worth rinsing your hair with fresh water rather than waiting until the evening.<\/p>\n<p>We won\u2019t go into heat styling separately here \u2013 a flat iron needs protection after colouring just as much as before. For how to choose a product for your hairdryer, straightener or curling iron, see our article on <a href=\"\/en\/tepelna-ochrana-vlasu\/\">heat protection for hair<\/a>.<\/p>\n<\/section>\n<section>\n<h2>Myths about caring for coloured hair<\/h2>\n<p><strong>\u201cConditioner washes colour out.\u201d<\/strong> Quite the opposite. Conditioner smooths the cuticle after shampooing, which makes it harder for pigment to escape. The only problem is very rich, oily products applied straight after dyeing \u2013 in that case, wait until the first wash.<\/p>\n<p><strong>\u201cColoured hair should be washed every day with a special shampoo.\u201d<\/strong> Even the mildest shampoo, used daily, will remove more colour than a stronger one used every three days. How often you wash matters as much as what\u2019s in the bottle.<\/p>\n<p><strong>\u201cYou don\u2019t need a mask \u2013 the dye kit already comes with conditioner.\u201d<\/strong> The kit conditioner closes the cuticle after colouring, and that\u2019s it. It won\u2019t carry you through the next 4\u20138 weeks while the colour lasts.<\/p>\n<\/section>\n<section class=\"faq-section\">\n<h2>Frequently asked questions<\/h2>\n<details class=\"faq-details\">\n<summary>How long does hair dye last?<\/summary>\n<p class=\"faq-answer\">Permanent dye usually lasts 4\u20138 weeks, toners 2 to 4 weeks. It depends on hair porosity, how often you wash, water temperature, water hardness and sun exposure. Red and copper shades fade faster than others.<\/p>\n<\/details>\n<details class=\"faq-details\">\n<summary>When can I wash my hair for the first time after colouring?<\/summary>\n<p class=\"faq-answer\">No sooner than 48\u201372 hours. During that time the cuticle closes and the pigment settles better into the fibre. Use warm, not hot, water for the first wash.<\/p>\n<\/details>\n<details class=\"faq-details\">\n<summary>Does a shower filter help with hard water?<\/summary>\n<p class=\"faq-answer\">It depends on the filter. Most inexpensive models remove chlorine but have little effect on calcium and magnesium. If hardness is the real problem, look for a filter that specifically claims water softening, or use filtered water at least for the final rinse of the lengths.<\/p>\n<\/details>\n<details class=\"faq-details\">\n<summary>How often should I use a mask on coloured hair?<\/summary>\n<p class=\"faq-answer\">1\u20132 times a week, on damp, squeezed-out lengths. For heavily bleached or porous hair you can use it more often in the first weeks after colouring, then go back to your usual routine.<\/p>\n<\/details>\n<\/section>\n<section>\n<div class=\"cta-container\">\n    <span class=\"cta-block__eyebrow\"><strong>Xiaomoxuan Europe<\/strong><\/span><\/p>\n<h3>Care for coloured lengths \u2013 the Collagen line<\/h3>\n<p>A hydrolysed collagen mask for porous hair after colouring and bleaching. Delivery across the EU.<\/p>\n<div class=\"button-container\">\n      <a href=\"\/en\/produkt\/ua-maska-z-kolagenom-550-ml\/\" class=\"cta-button\">Buy the Collagen Mask 550 ml \u2192<\/a><br \/>\n      <a href=\"\/en\/sklep\/\" class=\"cta-button\">All Xiaomoxuan products \u2192<\/a>\n    <\/div>\n<\/p><\/div>\n<\/section>\n<p>        <div class=\"xmxcz-preferred-source\" lang=\"en\">\n            <div class=\"xmxcz-preferred-source__icon\">\n                <svg width=\"30\" height=\"30\" viewBox=\"0 0 24 24\" aria-hidden=\"true\">\n                    <path d=\"M12 2.5l2.9 6.34 6.98.67-5.27 4.73 1.56 6.86L12 17.77l-6.17 3.33 1.56-6.86L2.12 9.5l6.98-.67L12 2.5z\"\/>\n                <\/svg>\n            <\/div>\n            <h3 class=\"xmxcz-preferred-source__title\">Want tips on hair and body care to show up first?<\/h3>\n            <p class=\"xmxcz-preferred-source__text\">One click \u2014 and Google will more often show you Xiaomoxuan&#039;s articles and tips (including in AI search), when you&#039;re looking for advice on hair care, body care, or choosing cosmetics.<\/p>\n            <div google-add-preferred-source-btn><\/div>\n            <p class=\"xmxcz-preferred-source__fallback\">\n                Button didn&#039;t appear?                <a href=\"https:\/\/www.google.com\/preferences\/source?q=xiaomoxuan.cz\" target=\"_blank\" rel=\"noopener\">Add us as a preferred source here \u2192<\/a>\n            <\/p>\n        <\/div>\n        <\/p>","protected":false},"excerpt":{"rendered":"<p>For the first couple of weeks after the salon, your colour looks exactly the way you wanted it to. Then&#8230;<\/p>\n","protected":false},"author":2,"featured_media":8290,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-7928","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"_links":{"self":[{"href":"https:\/\/xiaomoxuan.cz\/en\/wp-json\/wp\/v2\/posts\/7928","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xiaomoxuan.cz\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xiaomoxuan.cz\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xiaomoxuan.cz\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/xiaomoxuan.cz\/en\/wp-json\/wp\/v2\/comments?post=7928"}],"version-history":[{"count":19,"href":"https:\/\/xiaomoxuan.cz\/en\/wp-json\/wp\/v2\/posts\/7928\/revisions"}],"predecessor-version":[{"id":8312,"href":"https:\/\/xiaomoxuan.cz\/en\/wp-json\/wp\/v2\/posts\/7928\/revisions\/8312"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xiaomoxuan.cz\/en\/wp-json\/wp\/v2\/media\/8290"}],"wp:attachment":[{"href":"https:\/\/xiaomoxuan.cz\/en\/wp-json\/wp\/v2\/media?parent=7928"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xiaomoxuan.cz\/en\/wp-json\/wp\/v2\/categories?post=7928"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xiaomoxuan.cz\/en\/wp-json\/wp\/v2\/tags?post=7928"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}