Chemical ServicesCâu 83 / 100
A patch (predisposition) test is performed before certain color services to:
a.Check the hair's length
b.Measure the pH of the scalp
c.Determine curl pattern
d.Detect a possible allergic reaction to the product
Giải thích
A patch test applies a small amount of product, often behind the ear or on the inner arm, 24 to 48 hours ahead to see whether the client reacts. It is especially important for aniline-derivative (oxidation) tints that can cause allergic reactions.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Chemical hair relaxers work by:
- A permanent wave (perm) changes the hair by:
- In permanent waving, the neutralizer (fixative) is applied to:
- Which type of haircolor lasts the longest and involves a chemical change within the hair?
- Hydrogen peroxide in haircolor acts as the:
- A strand test is used during a chemical service to:
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