Colour Hair Part 2

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

The pH Scale