Progressive hair-dye products

Progressive hair dye products contain lead in the form of lead acetate (FDA 2011b). These dyes are applied over a period of time to achieve a gradual hair color change. People using such dyes have been monitored and no increase in blood lead level has been found from such use. However, a warning is required on these products that states they are for external use only, should not be applied in areas where there are scalp abrasions, and the product should not be allowed to get into eyes. 

It should be pointed out that there are other permanent hair-dye products which produce progressive hair colouration (by reacting with the sulfur of hair keratin) which are not formulated with oxidative hair dyes. The so-called progressive hair-dye products produce gradually a darkening of the hair. Lead acetate and bismuth citrate act as active ingredients in this type of products. 

Moreover, lead acetate, which has been extensively used as active ingredient in progressive hair-dye products (i.e. those that produce gradually a darkening of the hair), was also banned when Commission Directive 2004/93/EC came into effect. 

To our knowledge there are no published methods focusing on the determination of lead acetate and bismuth citrate in progressive hair-dye products. 

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See also in sourсe #XX -- [ , , ]

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