Dr R.J.W. Hefford – Consultant, Independent Cosmetic Advice Ltd
This is the first in a series of articles which is intended to give an introduction into the science and technology of products designed to colour the hair. This series will cover:
· The history of hair colouring.
· The structure of the hair as well as how it is damaged.
· How hair colour is described.
· The technology of current products which will include direct dyeing as well as oxidative systems and bleaching.
· How to formulate hair colouring products.
· How hair colouring products are positioned in the market.
· The safety and regulation of hair dyes.
· The future of hair colouring technology.
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