Page 68 - HAIR COLOUR

Chapter 8

Conclusion

Visible Light and How We See Hair Colour:

As visible light is absorbed by the human hair, the colours of its pigments
are reflected. This reflection is recognised by the red blue and green
Retina cone cells. By removing the human hairs natural pigments, the
hair will reflect and be recognised as white by the Retina cone cells in
human eye.

However, hair dye permanently removes some of the natural pigments
and replaces them with artificial pigments. The reflection is now changed,
and the human hair colour is now recognised as a different colour by the
red green and blue cone cells in the Retina.

Temporary Colour:

I did not bother to cover temporary colour in any chapter because in
reality it is no longer a professional service, it used to be that we mixed
hot water with a few drops of concentrated temporary colour (water rinse)
and sponge it through the hair after shampooing.

The water colour would stain only the top layer of cuticle scales without
any penetration; apart from shine it was pretty invisible except on
bleached and grey hair.

As time went on water colour was abandoned and colour setting lotions

took their place and later coloured mouse.

Semi-Permanent Colour:

Also, semi-permanent colour is applied after shampooing; penetration of
all the cuticle scales occurs but not the cortex. The colour is visible on
most natural base shades, grey and bleached hair. It can take up to six
weeks to shampoo out.

68