Real Henna is Never Black Black henna “PPD” causes burns, blisters, asthma, permanent scars, cancer, and internal damage to your organs.It can take several weeks to develop a reaction. please seek medical attention if you had a reaction to PPD “Black henna.” Real henna will only stain a coffee/burgundy tone. real henna will only last up to two weeks on the skin.bright reds, and other bold colors are synthetic/artificial dyes. they last longer on the skin. this is not real henna.all-natural henna is perishable and must be kept cold. commercial Shelf-stable henna cones are chemical based. this is not real henna. Stay safe & use Natural henna!Always ask your henna artist what’s in their henna paste!