Occupational studies stretching back decades have found an increased risk of bladder cancer among hairdressers.

I dyed my hair red in search of reinvention, and ended up on a journey of self-discovery. Read this personal essay about my ...

Eleven tested positive to PTDS; of these, several were also allergic to other substances in the hair dye series. There was only one patient who was allergic to ortho-nitro-PPD and not to PTDS.