Our tint does not contain the harsh chemical known PPD which is known to sometimes cause allergies however everyone reacts differently to cometic ingredients and it is important to always do a patch test before using any coloring product. To make sure you do not have an allergic reaction to Instant Tint , put a small amount of product inside your elbow, leave on for a minute and wipe off. If within 24 hours, no allergy develops, you should be OK to use the product on your eyebrows. If an allergy develops, immediately stop use, wash thoroughly and seek medical attention.