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Shamp👀 · FAQ · Product Safety · 公開 2026-05-01 Updated 2026-05-01

Patch Testing Protocols FAQ — Beginner Questions

要約

Frequently asked questions about patch testing protocols for salons, focusing on beginner questions.

📑 目次
  1. Q1. 48-hour wait seen as revenue loss — clients booked for same-day colour
  2. Q2. Test site (post-auricular) not standardised across staff
  3. Q3. Positive patch test result not recorded in permanent client file
  4. Q4. Product batch variation not accounted for — patch test done with sample A, service with batch B
  5. Q5. Henna and 'natural' dyes assumed patch-test-exempt
  6. Q6. Client pressure to skip test leads to waiver forms of dubious legality
  7. Q7. Patch-test training not refreshed when new products introduced
  8. Dialogue
    1. 🦉 & 🐥 & 🐮 — Salon operator dialogue
  9. Primary sources (national & international authorities)
    1. Related Articles
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Q1. 48-hour wait seen as revenue loss — clients booked for same-day colour

A: General solution

Q2. Test site (post-auricular) not standardised across staff

A: General solution

Q3. Positive patch test result not recorded in permanent client file

A: General solution

Q4. Product batch variation not accounted for — patch test done with sample A, service with batch B

A: General solution

🛠️ 関連する無料ツール: Run our salon opening checklist 無料で試す →

Q5. Henna and 'natural' dyes assumed patch-test-exempt

A: General solution

Q6. Client pressure to skip test leads to waiver forms of dubious legality

A: General solution

Q7. Patch-test training not refreshed when new products introduced

A: General solution

Dialogue

🦉 & 🐥 & 🐮 — Salon operator dialogue

🐥
Piyo: Poppo, why is 48 hours the standard wait time for a patch test?
🦉
Poppo: Type IV delayed hypersensitivity — the immune response to hair dye allergens like PPD — peaks at 48–72 hours. A test read at 24 hours misses most positive reactions. That's why the 48-hour minimum is non-negotiable, and the EU ALG regulation reinforces this.
🐥
Piyo: Can a client sign a waiver to skip the patch test?
🦉
Poppo: A waiver doesn't protect you. If a client suffers anaphylaxis from a product you applied without testing, 'they signed a waiver' is not a legal defence in most jurisdictions. The duty of care rests with the professional providing the service.
🐮
Mou: Strong, kind, beautiful — 48 hours of patience prevents a lifetime of regret.

Primary sources (national & international authorities)

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重要な免責事項： MmowWは美容衛生認証機関ではありません。上記の内容は、各国当局の一次ソース（WHO・FDA・EU規則1223/2009・各国衛生当局）から抽出した教育目的のベストプラクティス情報です。最終責任はサロン事業者および所轄当局にあります。常に一次ソースおよびお住まいの規制当局でご確認ください。
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澤井 隆行 — 行政書士

行政書士・MmowW創業者。世界中のサロン衛生コンプライアンスを極楽にする。

安全で、愛される。