1. APPLY THE PRINCIPLES OF HAIRDRESSING SCIENCE
WRHHS301A

3. Hair Analysis - porosity
Structure of skin
Functions of skin
3 layers of hair
Hair follicle shape
3 stages of hair growth
Natural hair colour
Hair Analysis porosity
- elasticity
- density
- texture
Effects on hair - environmental
- mechanical
- chemical
Chemistry
pH Scale

4. Structure of skin

5. 3 Layers of hair CUTICLE – protective layer outer layer
cross section of hair
CUTICLE – protective layer
outer layer
CORTEX – hair colour exists
chemically effected
MEDULLA – inner layer
often not present in some hair types

6. Hair Follicle
The angle of the follicle determines the shape of the hair Round=straight Oval=wavy Olliptical(flat)=curly

7. 3 Stages of hair growth

8. Natural hair colour
All natural hair colour contains a mixture of Black , brown, red & yellow colour pigments
Black/brown pigments are called Eumelanin
Red/yellow pigments are called Pheomelanin
Hair colour results from the amount and % of one or both of these colour pigments

9. Hair Analysis
Porosity
Elasticity
Density
Texture

10. Effects on hair
Environmental
Chemical
Mechanical

11. Chemistry Matter - everything, everywhere is matter - solids
- liquids
- gases
Elements (118) - all matter is made up of elements
Atoms - the smallest complete unit of an element - protons
- neutrons
- electrons
Molecules - 2 or more atoms joined together by a chemical
bond
Chemical bond - amino acids
- peptide bonds
- side bonds ( salt / hydrogen / disulphide / Van Der
Waal’s forces )

12. The pH Scale
The pH scale is a unit of measurement that indicates whether a substance is acidic, neutral or alkaline

13. Project Picture of the Structure of skin
Briefly describe each Functions of skin - inc: sweat gland / sebaceous gland
3 layers of hair and each function
Hair follicle shape and the effect on hair
3 stages of hair growth, what occurs in each stage
Natural hair colour, what is it? What makes up hair colour?
Hair Analysis porosity
- elasticity
- density
- texture
Effects on hair environmental
- mechanical
- chemical
Chemistry, briefly outline the chemistry behind hair
pH Scale – hair & skin, shampoo, ammonia, peroxide,
acid perm, alkaline perm, relaxer, neutraliser, bleach, tint,
gel, hairspray