Page 3 - BLEACHING_Neat
P. 3
THINGS TO KNOW ABOUT BLEACHING Daylight has a visible spectrum and an invisible spectrum
the visible spectrum has wavelengths compatible with pigments.
For those of you who have read “Understanding Light and Hair Colour” The wavelengths purple through to green reflect the pigments in Eu-melanin.
will already understand how the human eye sees colour. The wavelengths yellow through to red reflect the pigments in Pheomelanin.
Please see diagram on the previous page.
The human hair contains pigments that determine the colour recognised
by the human eye when white light (Daylight) is absorbed and reflected. How is this relevant to bleaching hair?
It is this reflection we see as colour not the actual human hair structure itself.
How does this work?
The hair swatch above has been bleached to within
a half inch at the roots, the bleach has removed all of the pigments.
When white light reaches the hair swatch it reflects all the pigments
in the unbleached roots as dark brown.
Where the same white light reaches the bleached hair
there are no pigments, so the hair reflects as white.
How do we know this to be true?
