weird ratios (20:80??) but this is a starting place for learning more about this topic

This is the main EU database of cosmetic ingredients.

consumer education site about the risk of allergy to hair dye, advises to do an allergy test 48 hours in advance to be sure.

Industry news

Market research in Europe on public concern with the effect of air pollution on hair.

Overview of EU regulations for hair dye products

Another common ingredient in permanent / oxidative hair dyes that has been known to cause severe allergic reactions, and has been shown to cause Skin sensitization, cancer, organ system toxicity, and has mutagenic properties.

A common ingredient in hair dyes, which is a skin and eye irritant, skin sensitizer, causes organ system toxicity, and possible endocrine disruption.

They have the German shampoos & conditioners that come in pump bottles for 4,50 per! Including color protection shampoo.