Value Village ／ Beauty
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 It stays unpublished until legal review and source verification are complete.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.
| 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 |
[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.
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.
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.
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.
Wet hair has an open cuticle and loses pigment easily. Colour lasts better if you dry it promptly.
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.
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https://www.jhcia.org/
https://www.jcia.org/user/public/knowledge/usage
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.
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.
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