Problems Caused by Ammonia, PPD, Hydrogen peroxide, and other harsh Chemicals Ammonia lifts hair cuticles leaving them exposed to future damage with brittle and rough hair. Hydrogen peroxide causes the loss of natural hair color and extreme drying out of hair. Sensitizers like PPD are known as common allergens. They can vary from anywhere between itchy scalp, skin irritation, swollen patches on the head, face, or eyes, redness of the skin, blisters on the head to straight-up anaphylactic shock which … Continue reading Ammonia free PPD free hair dye: PPD free Hypoallergenic hair dye