The effects of different colouring products
The effects of different colouring products
Learning objective
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The effects of different colouring products
Learning objective
Lesson title
Learning objective
How different colouring products effect the hair structure
For each colouring product, you need to be able to identify the following about each colouring product:
What size colour molecules are found in the product?
How does the colour effect the hair structure?
Temporary Colour
Large colour molecules which stain the cuticle.
Does not penetrate into the cortex.
Lasts 1-2 shampoos.
Semi Permanent colour
Large and small colour molecules.
Small colour molecules are deposited into the hair cuticle and outer edge of the hair cortex.
Colour will last 6-8 washes.
If the hair is unevenly porous, the result may be patchy.
Quasi permanent colour
Mixed with a low volume peroxide (1:2 ratio).
Small and medium colour molecules enter the cortex and oxidise by the oxidant (peroxide)
Due to low peroxide, the colour molecules do not become very large and are gradually lost each time the hair is shampooed.
Lasts around 12 weeks.
Permanent colour
Mixed with hydrogen peroxide.
The strength of the peroxide used varies depending on the desired result. Normally 4%, 6%, 9%, 12%.
When mixed with peroxide the small molecules penetrate through the cuticle and into the cortex.
Lightener
