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Definition of Black henna

Black henna: A tattoo ink and paste consisting of henna with other ingredients added, sometimes including para-phenylenediamine (PPD). Allergic reactions to PPD include a contact dermatitis, itching, blisters, open sores, scarring of the skin . Allergic reactions to PPD may also lead to sensitivity to other products such as hair dye, sun block and some types of black clothing. Also called blue henna.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=24093
Last Editorial Review: 9/20/2012

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