Perform a patch test 48 hours prior to each application. Mix a coin-sized amount of the color formula and developer in a bowl. Use a cotton bud to apply a small amount of the color mixture in the bend of the elbow or behind the ear. Let the test spot dry and leave on for 48 hours before washing off. If no reaction has occurred, proceed with color application. If any signs of an allergic reaction occur (itching, swelling, irritation, or redness), wash off immediately and do not proceed with color application.
