Examining Hair Colorants Using Lead Acetate

Lead is one of mankind’s oldest used metals. Lead and its compounds have been used for thousands of yeas in all walks of life, from construction to gastronomy. It is not so long ago that sewage pipes were made from lead. If you have renovated an old building, you might have noticed leaded pipes as they were replaced. They are easy to recognise by their unusual weight. However, lead and most of its compounds are today known to be toxic. Lead is a potent neurotoxin that over time accumulates in soft tissues and bone. Nevertheless, because of its low reactivity and solubility, lead poisoning usually only occurs in cases when the lead is dispersed and after long term exposure.

Lead acetate is one of the main active substances used in progressive hair colorants. It is valued due to its ability to change the colour of your white hair gradually and unnoticeably. Like lead, it is toxic, although it has been used for centuries as a wine sweetener. Since the beginning of the 1980s, lead has been withdrawn from many products, such as gasoline, paints, pipes, etc., and in the last decade lead compounds such as lead acetate have become the target of increased attention. Lead acetate has been withdrawn from hair dyes in several counties of the European Union and Canada but there is no universal ban within the EU, let alone on elsewhere. However, lead-based hair dyes continue to be available in stores in most countries in the world.

In one recent study, conducted in the US, people using lead acetate-containing hair colorant were observed but no absorption of lead into their blood stream could be registered. Hence, it was determined that lead acetate-based hair colorants can remain in use but the concentration of lead acetate may not exceed 0.6%. Most of the currently available hair dyes contain a maximum of 0.4% of lead acetate. In spite of that, these products may not be applied on facial hair or cut scalp and if redness or inflammation appear their use must be discontinued. You should properly wash your hands after applying them.

Since the toxicity of lead has become more apparent in recent years and it is even suspected of being carcinogenic, bismuth has become its increasingly important substitute. Following a ban on sales of lead-containing hair colorants in some countries, the products affected have been reformulated to include bismuth citrate. Bismuth, like lead, also happens to be a heavy metal but it is thought to be much less toxic and it has not been found to be carcinogenic. Nevertheless, the same cautious handling is required when applying bismuth-based hair colorants as with lead-based products.

Filed under: Covering Gray Hair