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What are the common misunderstandings about caring for silk?

This answer is a draft. It stays unpublished until legal review and source verification are complete.

The answerThe biggest misunderstanding is "silk cannot be washed at home". If the care label shows the hand-wash symbol, you can wash it at home. Failures come not from washing itself but from water temperature, the type of detergent, rubbing, and sunlight. The basics are "30°C (86°F) or below, neutral detergent, press-wash, dry in the shade".

Around the world, silk is avoided as "difficult to look after". Japan, however, has generations of know-how from handing down silk kimono within families. Here we set that know-how out alongside Japan's care-label system, so you can read the label on a silk item bought here and act on it.

What to go by

ItemGuideWhy
Care label (Japan uses the international JIS L0001 symbols)Tub with a hand = hand-wash OK; tub with × = do not wash at homeJIS L0001
Water temperature30°C (86°F) or belowProtein fibres shrink and stiffen with heat
DetergentNeutral, sold for "delicates" (おしゃれ着用洗剤, oshare-gi-yō senzai). No alkaline detergent, no bleach, no enzyme detergentSilk is a protein (fibroin) and is weak against alkali and enzymes
How to washPress-wash for 2–3 minutes. Do not rub, do not soakFriction causes fuzzing and brightening
How to dryIn the shade. Direct sun causes yellowingUV light discolours and degrades the fibre
IroningUp to two dots (150°C), with a pressing cloth; many items say no steamWater drops leave marks (water stains)
[Verify] Check the meaning of the symbols on the Consumer Affairs Agency's "Care labelling" page. The temperature guides are based on guidance from textile bodies and makers.

Misunderstanding 1|Silk has no option other than the dry cleaner

If the label shows the hand-wash symbol, you can wash it at home. For expensive, dark-coloured or lined items, asking a dry cleaner is the safer side.

Misunderstanding 2|Washing with shampoo does no harm

Shampoo ingredients vary widely from product to product, and some are alkaline or leave conditioning agents behind. A neutral detergent for delicates is the reliable choice.

Misunderstanding 3|The colour ran because of the detergent

Silk is a fibre whose dyes dissolve easily in water. Test for colour-fastness in a hidden spot, and wash on its own and briefly. Water stains (marks left only where the fabric got wet) are also a characteristic of silk.

Misunderstanding 4|The white patches are dirt

They may be fuzzing caused by friction (brightening, or fibrillation). This is fibre damage, not dirt, and it does not come back. Prevention means not rubbing when washing, and avoiding a bag strap rubbing the fabric when wearing.

Misunderstanding 5|For storage, plenty of moth repellent is the safe choice

Silk is a fibre moths readily eat, so repellent is needed, but direct contact with the repellent can discolour it. Wrap the item in non-woven fabric and place the repellent on top of the clothes. For long-term storage, air it in the shade once or twice a year.

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Sources

https://www.caa.go.jp/policies/policy/representation/household_goods/guide/wash_02.html

https://www.qtec.or.jp/

https://www.zenkuren.or.jp/

⚠️ 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.

Sources

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