Cosmetology · Chemical Texture Services

Why should incompatible chemical services not be layered carelessly (for example, certain treatments over others)?

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Correct answer

Combining incompatible chemical processes can cause severe damage or breakage

A It has no effect
B It saves product
C Combining incompatible chemical processes can cause severe damage or breakage
D It improves shine

Why this is the answer

Layering incompatible chemical services — for example, applying certain strong chemicals over hair already treated with another incompatible process — can cause severe damage, breakage, or unpredictable reactions, because the hair's bonds and condition may not tolerate the combination. This is why knowing the client's chemical history and doing strand tests is essential before a new chemical service. The cosmetologist must assess compatibility and the hair's condition first. Awareness of chemical-service compatibility and its risks is important safety content on the exam.

Source: Hair Care — Chemical Compatibility

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About this topic: Chemical Texture Services

Chemical texture services — permanent waving, relaxing and curl reformation — are tested on the chemistry (reduction and oxidation), the products (thio, hydroxide), processing and neutralising, and the safety checks before and during the service. This is one of 11 Hair Care questions on chemical texture services, each with a full explanation on a single study page.

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Why should incompatible chemical services not be layered carelessly (for example, certain treatments over others)?

Why this is the answer

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About this topic: Chemical Texture Services

Related questions

Chemical texture services (perms and relaxers) permanently change the hair by:

Why is a thorough hair and scalp analysis (and often a strand test) essential before a chemical texture service?

An open sore, abrasion, or scalp irritation generally means a chemical texture service should be:

When performing a chemical service, the cosmetologist should protect themselves by:

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