A patch test is a preliminary test to be conducted before the product is applied to the hair and scalp.
To perform a patch test:
- Select a small test area of the skin behind the ear.
- Wash the test area with a mild cleanser and water and pat dry.
- Ensure the test area is clean and dry before applying the product.
- Using a cotton bud, apply a pea size amount of hair colour in a thin layer to the test area and let it dry.
- Leave the test area uncovered and undisturbed for 24 hours.
- Examine the test area carefully for any signs of redness or irritation, if irritation occurs, then discontinue use of the product.