How can I slow down hair-colour fading, and how many days does colour last?
This answer is a draft. It stays unpublished until legal review and source verification are complete.
You have your hair coloured at a Japanese salon, and within one or two weeks the colour has washed out and turned orange. Japanese hair in particular contains a lot of red-toned melanin, so ash and other cool shades seem to fade fastest — something worth knowing if you have come from a country where your hairdresser worked on a different base colour. Once you understand how colour leaves the hair, it becomes clear which care actually helps.
Why colour fades, and what to do
| Cause | What happens | What to do | Effect |
|---|---|---|---|
| Shampoo | Pigment molecules are washed out by water and surfactants. A little every time you wash | Do not wash on colouring day (pigment takes 24–48 hours to settle), lukewarm water (38°C or below), amino-acid based colour-care shampoo, no more than once a day | Large |
| Heat | Hairdryer and iron heat break down the pigment | Dry straight after towel-drying (the longer hair stays wet, the more washes out), irons at 160°C or below, protect with a leave-in conditioner | Medium to large |
| UV light | Pigment and melanin break down; red and yellow tones appear | Hat, parasol (日傘, higasa — common in Japan), UV spray for hair | Medium (large in summer) |
| Chlorine and sea water | Colour is stripped in pools and the sea | Wet the hair and apply conditioner before going in; wash as soon as you come out | Medium |
| Damaged cuticle | After bleaching or repeated colouring, the hair cannot hold pigment | Damage care, fewer bleaching sessions, talk to your stylist | Fundamental |
- Why cool shades (ash, grey) fade fast: Japanese hair has a lot of red-to-orange melanin, and cool shades work by cancelling that out with blue and green. Blue pigments have small molecules and wash out quickly, so as the cancelling effect weakens, the orange comes back. Many people see the change within 2–3 weeks.
- Warm shades (brown, red, pink) are close to the colour of the natural melanin, so fading is less noticeable and they look good for 4–6 weeks.
- Colour shampoos and colour-depositing conditioners (カラーシャンプー / カラートリートメント): products that add pigment to the surface of the hair. Purple (ムラサキ, murasaki) shampoo cancels yellow, silver maintains ash, and pink and brown top up warm shades. Use once or twice a week, leaving it on for the time stated on the pack. Watch out for staining on bathroom surfaces and towels.
- How to wash: rinsing with warm water alone for 1–2 minutes (予洗い, pre-wash) removes 70–80% of dirt, so use only a small amount of shampoo. Wash the scalp and just rinse the ends; colour lasts longer.
- Salon intervals: roots only (リタッチ, retouch) every 1–1.5 months; full colour every 2–3 months. Frequent full colouring damages the hair, which in turn makes colour fade faster — a vicious circle.
- With grey coverage (白髪染め, shiraga-zome) the pigment is denser, so the issue is less fading than root regrowth showing, on a cycle of 3–4 weeks (see our separate article on grey coverage).
[Verify] The fading periods are general guidelines from the hairdressing industry. Check the description of dye ingredients and pigment setting against materials from the Japan Hair Color Industry Association.
Misunderstanding 1｜Not shampooing on colouring day is unhygienic
Pigment takes 24–48 hours to settle, and shampooing on the day speeds up fading. Rinse with water only, or wait until the next day.
Misunderstanding 2｜An expensive shampoo stops colour from fading
Any shampoo will wash out some pigment. The most you can do is "slow it down" with a gentle formula, lukewarm water and fewer washes.
Misunderstanding 3｜Once it fades, recolour the whole head straight away
Repeated full colouring damages the hair, and damaged hair holds even less pigment. Top up with colour shampoo or colour-depositing conditioner, and recolour mainly at the roots.
Misunderstanding 4｜Air-drying keeps colour longer because no heat is involved
Wet hair has an open cuticle and loses pigment easily. Colour lasts better if you dry it promptly.
Misunderstanding 5｜I asked for ash and it went orange in a few weeks — the salon got it wrong
On Japanese hair it is normal for cool shades to show red tones again within 2–3 weeks. Ask your stylist about "the colour after it fades" as well, and the gap between expectation and result will shrink.
---
Sources
- Japan Hair Color Industry Association, "Hair colour basics: fading and care" [ヘアカラーの基礎知識：色落ちとお手入れ]
https://www.jhcia.org/
- Japan Cosmetic Industry Association, "Using cosmetics correctly: hair-care products" [化粧品の正しい使い方：ヘアケア製品]
https://www.jcia.org/user/public/knowledge/usage
- Japanese Dermatological Association, "Dermatology Q&A: hair" [皮膚科Q&A：毛髪]
https://www.dermatol.or.jp/qa/
⚠️ Editorial note: the source URLs above were identified by search. Our working environment cannot reach go.jp domains, so the contents have not been checked against the text. Verify every source before publication and record who checked it and when.
About this article
What we share here are ideas and everyday practices passed down among people living in Japan, together with general information drawn from public sources. They are not official recommendations, and they are not professional instruction. Practices vary between households and regions.
This is general information. Results vary from person to person and depend on your own conditions and surroundings.
Please decide for yourself, using your own judgement, whether any of this suits your situation. We cannot accept responsibility for any damage, loss or injury arising from following this article.
Cosmetics are not medicines and are not meant to diagnose, heal or prevent any condition. If your skin reacts, stop using the product and see a dermatologist.
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