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Grecian formula is one of several progressive hair colorants that rely on lead acetate and sulphur as their principal active ingredients. These products are mainly popular among male customers. They restore the original hair colour gradually so the colour change is not as noticeable as with regular hair dyes. They are not messy, one does not need plastic gloves to apply them and they can be used to colour hair selectively. The applied substance both coats and penetrates the hair shaft and the lead acetate reacts with the sulphur to produce a dark pigment. If applied correctly you get good results, especially for people with fine hair and a light hair colour. Many consumers complain about the weird smell of these products but the main drawback is their toxicity. The prime culprit is lead acetate.

Read more about possible health risks of using metallic based hair colorants.