Allergic contact dermatitis to substitute hair dyes in a patient allergic to para phenylenediamine: Pure henna, black tea and indigo powder
We report a case of a 50 year old lady with allergic contact dermatitis to para phenylenediamine, who in her quest to find a substitute hair dye, subsequently reacted to a number of plant based hair dyes, including pure henna, black tea and indigo powder respectively. While these substances all contain tannins, testing to possible constituents tannic acid and gallic acid was negative.
The Australasian journal of dermatology