A new study says there are dangerous chemicals that we should avoid in many cosmetic products, particularly those marketed to black women . We learned more about the evolution of these products and the dangers they may pose. We checked in with Nneka Leiba of the non-profit Environmental Working Group , Atlanta hair stylist Latasha Gray , and self-proclaimed “black hair historian” A'Lelia Bundles , who is also the great-great-granddaughter of Madam C. J. Walker.