“Okay Google…search ‘eyebrow henna.'” A robotic voice replies, “Here are the results from the search.” My thumb swipes upwards in a circular motion as I scroll through hundreds of results and several services offering “henna” for eyebrows. The biggest disappointment is that none of the results show pure henna.

Introduction Para-phenyelenediamine (PPD) is one of the most common allergens in cosmetics. While genetics can increase chances of allergy, anyone can develop a PPD allergy. High concentrations and repeated exposure increase the likelihood of becoming sensitized. Basic information about PPD is covered in an earlier article, What You Need to Know About Para-Phenylenediamine. Occupations that […]

This article serves as the introduction to a series on Para-phenylenediamine (PPD): its health risks, history, and politics. In the coming weeks, articles will be published which explore each section in greater detail.               Para-phenylenediamine, or a chemically related -diamine is an ingredient used in virtually all oxidative hair dyes, both store-bought and used in […]