Unit 306: Colour hair using a variety of techniques
Worksheet 1: Hair and skin tests
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Discuss with your tutor the different hair and skin tests and complete the rest of the table.
Consider the following tests, when you would carry them out, how to carry them out and why. Also consider manufacturers’ instructions and legal requirements in relation to carrying out tests.
Type of test Purpose of test (why) How to carry out When to carry test out Expected results Unexpected results What could happen it test not carried out
Porosity test To determine how porous the hair is.

Using the first finger and thumb, slowly run down length of two or three hairs from points to roots on dry hair.
Before services Hair feel smooth Rough rised cuticle Damage to the hair increase porosity
Poore finishing result
Discoloration to the hair
Elasticity test To see if the hair can stretch and spring back to its natural length. Tests how much moisture is in the hair structure.
Take one or two hairs and gently stretch and let return. Must be carried out on wet hair.

On wet hair befor services Hair stretch back to its natural state Hair breaks Damage to the hair
Incompatibility test To test for presence of metallic compounds.
Place a small amount of hair cutting in solution of hydrogen peroxide (6%) and ammonium hydroxide (ratio 20:1).
Before colouring and perming services No reaction to the solution Hair bubble , give off smell and may fizz Damage to the hair , client taking legal action
Skin test To test for allergic reactions to Para compounds.
A small amount of colour to be used mixed with hydrogen peroxide is placed behind the ear or on the inside of the arm at the elbow and left to develop (normal development time). Skin must be clean of perfume etc.
Before service No reaction Redness , itch , swollen Expected result not achieved, allergic reaction, client taking legal action
Strand test To check the development of colour or bleach....