Look out for potentially harmful substances such as ammonia, resorcinol, parabens, and phthalates. If you frequently change your hair colour, be cautious with dyes like henna, which can be ...
Ammonia, NH 3, is an alkaline gas and so turns damp red litmus paper blue. Ammonium ions (NH 4 +) – found in ammonium compounds such as ammonium chloride, ammonium nitrate and ammonium sulfate ...