Colour Hair Part 2
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Created on November 20, 2023
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Level 2 Hairdressing - Part 2UHB23 Lliwio gwallt: effaith cynhyrchion lliwio ar gwallt UHB23Colouring hair: the effects colouring products have on the hair
Temporary ColourLliw Dros Dro
- Direct dye requires no mixing
- No skin test required
- No age restriction
- Temporary colour will not lift or lighten
- The colour coats the surface of the hair but does not penetrate the cuticle
- The pH value for a temporary colour is low acidity, causing the least damage to the hair structure
- Temporary colour normally lasts only one shampoo
Temporary ColourLliw Dros Dro
Semi Permanent ColourLliw Lled Barhaol
- Less damaging to the hair structure because it has a lower pH value
- pH value is 6.8.
- The colour will last for between 4 to 8 washes.
- If the hair is unevenly porous, the result may be patchy.
- Skin test is required
- Age restriction
- Do not colour hair on age under 16 years
- No grey coverage
Semi Permanent ColourLliw Lled Barhaol
Lliwiau quasi-permanent colours
- The quasi-permanent colour is mixed with a low-volume oxidant (1:2 ratio).
- pH value is 6.8-9.0.
- Age restriction.
- Do not colour hair on age: below 16 years
- Skin test is required .
- The colour is designed to fade over a period
- Choose quasi colour to apply to mid-lengths ans ends when you need to restore loss of depth and tone to permanently coloured hair
- Colourance core covers 50% of grey hair
- Colourance cover plus covers 75% of grey hair
Lliwiau quasi-permanent colours
- Age restriction below 16 years
- They are able to penetrate the cuticles because of their high alkaline content
- pH value is 7.5-9.5
- Permament colour is mixed with hydrogen peroxide
- The strength of the hydrogen peroxide used varies depending on the desired result (3, 6, 9 or 12%).
- The higher the peroxide the lighter the colour 4-5 levels of lift can be achieved
- Skin test
- 100% grey coverage
Permanent colours - Lliwiau Parhaol
- Oxidation is the chemical process that takes place when
- Colour and hydrogen peroxide are mixed together
- The hydrogen peroxide begins to break down into water and oxygen.
- The oxygen from the hydrogen peroxide joins together and oxidises the small colourless molecules.
- The oxidised molecules swell to form large, colour molecules.
- The large colour molecules are unable to pass back through the hair cuticle and become trapped within the hair cortex.
Permanent colours
Working with Hydrogen Peroxide
- What is the effect on the hair when a higher strength hydrogen peroxide is used?
- When 2-3 levels of lift are required what strength of peroxide would you choose?
- It is important to understand the pH scale because it will help you appreciate how different products affect the hair and skin.
- The term pH stands for power of hydrogen, which is a measure of how acidic or basic a chemical solution is
- The pH scale measures how acidic or alkaline a product is.
- Generally, acid-based products will close the cuticle scales to make the hair smooth and shiny, for example conditioners.
- Most of the chemical products used in hairdressing are alkaline-based and therefore open the cuticle scales and may cause damage to the hair.
- The more alkaline the product is, the more damaging it will be to the hair