Cosmetology · Hair and Scalp Science

Which test is performed before a chemical service to check how the hair will react, such as before perming or relaxing?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

A preliminary strand test (and, for color/products that can cause allergy, a patch/predisposition test)

A No test is needed
B A taste test
C A preliminary strand test (and, for color/products that can cause allergy, a patch/predisposition test)
D A blood test

Why this is the answer

Before chemical services, cosmetologists perform preliminary tests to predict results and protect the client. A strand test applies the product to a small section of hair to see how it reacts (for example, how the hair takes color or responds to a perm/relaxer). For products that can cause allergic reactions, such as some haircolors, a patch (predisposition) test is done on the skin in advance to check for sensitivity. Recognizing the purpose of these preliminary tests is important hair-science and safety content.

Source: Scientific Concepts — Preliminary Tests

Practice more questions

This question is from our Cosmetology Practice Tests practice test. Take the full practice test to test your knowledge across all Hair and Scalp Science and other topics.

Take the Scientific Concepts practice test →

About this topic: Hair and Scalp Science

Hair and scalp science covers the structure of the hair (cuticle, cortex, medulla), the follicle and growth cycle, hair types and the common scalp and hair disorders — which can be treated in the salon and which must be referred. This is one of 9 Scientific Concepts questions on hair and scalp science, each with a full explanation on a single study page.

New to this exam? Our Cosmetology exam guide explains the format, scoring, and how to prepare.

Study materials on Amazon

Core textbook

As an Amazon Associate, CJ Affiliate, and AWIN publisher we earn from qualifying purchases. Links above are affiliate links. Full disclosure →

Which test is performed before a chemical service to check how the hair will react, such as before perming or relaxing?

Why this is the answer

Practice more questions

About this topic: Hair and Scalp Science

Related questions

What is the technical term for the hair root area where hair growth begins?

The three main layers of the hair shaft are the cuticle, cortex, and:

Which layer of the hair contains the melanin that gives hair its natural color?

A condition caused by an infestation of head lice is known as:

Study materials on Amazon

Milady Standard Cosmetology

State board exam study guides

Cosmetology practice test books