The Association of Registered Trichologists ask world renowned Toxicologist and expert on hair dye safety, Dr David Basketter, whether published scientific literature supports the role of a PPD skin test when colourants is based on other dyes. The answer is an emphatic “yes”. In this special scientific article, Dr Basketter explains why.
In response to various queries, here’s a republication of an article we produced back in 2013. It’s been 20 years in development, but now Proctor & Gamble (P&G) have announced they’ve developed a new molecule that offers permanent colour performance with a reduced risk of inducing allergy*. The new ingredient, 2-methyoxymethyl-p-phenylenediamine, is called ME+ for […]