What are the common misunderstandings about colour running in the wash?
This answer is a draft. It stays unpublished until legal review and source verification are complete.
"My white shirt came out pink" is the world's most common laundry story. In Japan, the change to the care-label system has put "machine washable" on more garments, and attention to colour transfer has slipped as a result. This article covers how dye moves between clothes and the everyday habits Japanese households use to stop it.
When colour transfers
- Dye dissolves into the water (in the wash liquor) → and settles on other garments
- Wet garments touch (left in the drum after the cycle, stacked after spinning) → dye moves directly
- The hotter the water, the more readily dye dissolves
| Prevention | How |
|---|---|
| Colourfastness test | Wet an inconspicuous spot, press a white cloth on it and see whether any colour comes off |
| Wash separately | Whites apart from darks. Wash new dark garments alone for the first few washes |
| Lower the temperature | As low as the label allows |
| Don't leave it in the machine | Hang up as soon as the cycle ends. Leaving wet clothes stacked together is the most dangerous moment |
| Colour-catcher sheets | A shop-bought sheet (色移り防止シート, iroutsuri bōshi shīto) that absorbs dye in the wash water. Use as a back-up |
If the wash-tub symbol on the care label (Japan uses the international JIS L0001 symbols) has bars underneath, a gentler machine setting is called for. Respecting the wash intensity also helps limit dye loss.
[Verify] Check the meaning of the symbols against the Consumer Affairs Agency's "Care labelling" page.
Misunderstanding 1｜One wash and a new garment is safe
Dark colours (black, navy, red, denim) keep releasing a little dye however many times they are washed. The basic rule is never to wash them with whites.
Misunderstanding 2｜Bleach will restore a garment that has picked up colour
Chlorine bleach cannot be used on coloured or patterned garments. Oxygen bleach (酸素系漂白剤, sanso-kei hyōhakuzai) sometimes brings them back, but check the fabric and the label (triangle symbol); acting before the garment dries is generally described as giving a better chance.
Misunderstanding 3｜Extra rinses will prevent it
Rinsing only reduces dye in the wash water; it does nothing against transfer by contact after spinning. Hanging up straight away matters more.
Misunderstanding 4｜With a colour-catcher sheet you can mix everything
The sheet is a back-up. There is no assurance it will catch everything, and it does not replace the basic rule of separating whites and darks.
Misunderstanding 5｜Hand-washing never transfers colour
Hand-washing transfers colour too if you soak the garment in the same water as others. The basics are alone and briefly.
---
Sources
- Consumer Affairs Agency, "Care labelling (from 20 August 2024)" [洗濯表示（令和6年8月20日以降）]
https://www.caa.go.jp/policies/policy/representation/household_goods/guide/wash_02.html
- National Consumer Affairs Center of Japan, "Laundry problems with clothing" [衣類の洗濯トラブル]
https://www.kokusen.go.jp/
- Government Public Relations Online, "It's the season to change wardrobes. Are you washing correctly?" [衣替えの季節です。あなたは正しく洗濯していますか？]
https://www.gov-online.go.jp/article/201812/entry-9307.html
⚠️ 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.
Follow the care label and the maker's instructions for any garment, shoe or bag. For expensive or sentimental items, ask a specialist cleaner or repairer.
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