When it comes to lightening hair with bleach there are numerous variables that a colourist must consider to achieve their client’s desired shade. These variables make bleaching hair both an art form and a science.
The Science: Natural hair colour pigment
Natural hair colour pigment, melanin, is produced within the germinal matrix of the hair bulb by cells called melanocytes. The melanocytes transfer melanin in small granules to the cortex of the hair shaft. These granules are associated with two types of melanin:
Eumelanin – black and brown pigment granules
Pheomelanin – red and yellow pigment granules
The proportions of these two types of melanin determines all natural hair colour – read more