Cosmetology · Haircoloring Principles

If a client shows a positive reaction (redness, itching, swelling) to a patch test, the cosmetologist should:

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Correct answer

Not perform the color service with that product

A Apply more product
B Apply the color anyway
C Ignore it
D Not perform the color service with that product

Why this is the answer

If a patch (predisposition) test produces a positive reaction — such as redness, itching, burning, or swelling at the test site — the cosmetologist must not perform the haircolor service with that product, because the client is showing a sensitivity or allergy that could cause a serious reaction if the product were fully applied. The service should be declined and the client advised accordingly. Respecting a positive patch test is a critical client-safety rule, and the exam expects candidates to know never to proceed after one.

Source: Hair Care — Positive Patch Test

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About this topic: Haircoloring Principles

Haircoloring principles cover the colour wheel and levels, the categories of haircolour (temporary to permanent), developers and volumes, lightening, patch tests and formulation. The chemistry of oxidative colour is tested every time. This is one of 8 Hair Care questions on haircoloring principles, each with a full explanation on a single study page.

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If a client shows a positive reaction (redness, itching, swelling) to a patch test, the cosmetologist should:

Why this is the answer

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About this topic: Haircoloring Principles

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