How do I do a patch test with natural Henna hair dyes?
Take a pinch of It's Pure henna powder from the packet and mix it with a drop of warm water on a saucer. Reseal the pack immediately. Do not allow the remaining henna powder to get wet.
Wash a small area of skin inside your elbow and dry gently but thoroughly. Apply the henna mixture to the area with a cotton bud and allow to dry. Do not wash off for AT LEAST 48 hours (Please be aware that in some cases the skin sensitivity/allergy test can take longer to react – up to a week for some people).
If during this period you experience any irritation, redness, swelling or burning, wash off immediately. It is likely you are allergic to an ingredient in this product and should not use it.