Bleach
wyeoman
Created on January 12, 2024
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Transcript
Working with Bleach
- Pre-lightening is a process of removing natural pigments from the hair.
- Pre-lighteners have a high alkaline content, during processing it penetrates the cuticle and the hair structure is softened and the cuticle scales are opened.
- When the cuticles are opened the bleach can penetrate easily.
- The same as permanent colour, the lightening chemical process involves the addition of oxygen
Egwyddorion Cyn-YsgleuwyrPrinciples of Pre-lightening
- All natural hair colour is made up of varying proportions of black, brown, red and yellow colour pigments found within the cortex of the hair.
- There are two main types of hair pigment:
- Eumelanin – brown and black hair pigments
- Pheomelanin – red and yellow hair pigments
- When the cuticles are opened the bleach can penetrate easily.
- Inside the cortex the bleaching process releases oxygen and combines with the hairs natural colour pigments.
- This forms a new colour pigment that is colourless called Oxy-Melanin
- Every head of hair has common factors relating to natural colour.
- The melanin black/brown pigments are larger and easier to remove from the hair structure,
- These are lifted out quickly leaving the Pheomelanin red/yellow pigments
- Pheomelanin pigments are much smaller and are a lot more difficult to remove and often it takes a long time to get past this yellow stage
- The darker the natural colour pigment is more intense and the lightening process can prove to be difficult
- Pheomelanin pigments are much smaller and are a lot more difficult to remove and often it takes a long time to get past this yellow stage
- The darker the natural colour pigment is more intense and the lightening process can prove to be difficult
Colourless oxymelanin
Natural colour pigment
- Melanin (black and brown pigments) are oxidised more easily than pheomelanin (red and yellow),
- therefore the oxidisation process takes place in three stages:
- The black and brown pigments are oxidised.
- The red pigment is oxidised.
- The yellow pigment is oxidised
- By watching the colour changes that occur during the bleaching process, the sequence of oxidation may be easily seen.
Bleach bases and their corresponding depths
- The bleaching process releases oxygen and combines with the hairs natural colour pigments. This forms a new colour pigment that is colourless, What is this called?
- Over processing of bleach could result in what?
- What dangers are associated with the inhalation of powder bleach/lightener?
- What are the potential consequences of not following manufacturers instructions during mixing and development of bleach?
- . Pheomelanin colour pigments are?
- If the hair contains a large amount of Eumelanin colour pigments and the client would like to achieve light blonde colour, What would your action be?
- What precautions must be taken when using powder and other lighteners ?
- If a problem occurred when colouring/lightening hair that you could not resolve, what should your action be?
- What client factors have an impact on colouring/lightening services?