The document discusses the effects of different hair coloring products: - Temporary color coats the hair cuticle and lasts 1-2 washes. Semi-permanent color deposits into the cuticle and outer cortex, lasting 6-8 washes. - Quasi-permanent color uses a mild oxidant to deposit color molecules into the cortex over 12 weeks. - Permanent color mixes with hydrogen peroxide, allowing small molecules to penetrate the cuticle and cortex where they swell into large, trapped color molecules. - Bleaching oxidizes natural pigments like melanin and pheomelanin in the cortex, changing them from colors like black and brown to colorless.

1. The effects of different colouring
products on the hair
• You will be looking at the effects of the following
colouring products on the hair:
• Temporary colour
• Semi-permanent colour
• Quasi-permanent colour
• Permanent colour
• Bleach.

2. The effects of temporary colour
 Large colour
molecules coat the
hair cuticle.
 There is no
penetration of the hair
cortex.
 The colour will last for
only 1 or 2 washes.

3. The effects of semi-permanent colour
 Small colour
molecules are
deposited into the hair
cuticle and the outer
edge of the hair
cortex.
 The colour will last for
between 6 to 8
washes.
 If the hair is unevenly
porous, the result may
be patchy.

4. The effects of quasi-permanent
colour
 The quasi-permanent colour is
mixed with a low-volume
oxidant (1:2 ratio).
 Different sized colour
molecules enter the cortex and
are oxidized by the oxidant.
 Because the oxidant is
mild, the colour molecules do
not become very large and are
gradually lost each time the
hair is shampooed.
 The colour is designed to fade
over a period of 12 weeks.

5. The effects of permanent colour –
stage 1
 The permanent colour
is mixed with
hydrogen peroxide.
small
 The strength of colourless
hydrogen peroxide molecules
used varies mixed with
oxidant
depending on the penetrate
desired result the cuticle,
(10, 20, 30 or 40 into the
cortex
volume).
 When mixed with
hydrogen
peroxide, the small
colourless molecules
penetrate the hair
cuticle and the hair

6. The effects of permanent colour –
stage 2
 The hydrogen peroxide
begins to break down small
into water and oxygen. colourles
s
 The oxygen from the molecule
hydrogen peroxide joins s mixed
together with and with
oxidises the small oxidant
colourless molecules. penetrate
 The oxidised molecules the
swell to form cuticle, in
large, colour molecules. to the
cortex
small
 The large colour molecule
molecules are unable to s swell
pass back through the and
hair cuticle and become become
trapped within the hair larger
cortex. due to
the
nascent
oxygen

7. The hair before bleaching
 Bleaching is the process of
Hair prior to bleach
changing the natural colour
application
pigments in the hair
so they become colourless.
Natural colour pigment.
 The natural hair pigments are
melanin and pheomelanin.
• Melanin pigments are black and
brown.
• Pheomelanin pigments are red
and yellow.

8. The hair after bleaching
The bleach penetrates
Hair after bleaching
the hair cortex and
oxidises
the natural colour
pigment so that itColourless,
becomes colourless.
oxymelanin
For example, brown
melanin pigments are
changed to colourless
oxymelanin.