Eleven tested positive to PTDS; of these, several were also allergic to other substances in the hair dye series. There was only one patient who was allergic to ortho-nitro-PPD and not to PTDS.
But don't just take my word for it - on Amazon, the product has an impressive 4.4 star with one shopper citing it as "The easiest thing to use and to style your hair." Another woman, who has short ...
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“One length works well, but depending on density, removing internal weight is your best friend—this will rid you of any triangle shape but keep the illusion your hair is all one length.