Current estimates suggest that 50-80% of women and 10% of men 40 years of age and over in the United States and Europe use permanent hair dye products. The aromatic amine p-phenylenediamine (PPD) is ...
At-home tips from a model, an artist and a professional colorist. By Kari Molvar Beauty School answers common beauty questions with help from creative people who’ve become experts on the job. Sign up ...
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