As allergies or adverse reactions can be sporadic and unpredictable, many products require skin sensitivity tests prior to use. Tests should be performed 48 hours before the product is applied, and must be performed each time the product is used.
- Add a small amount of product to be applied to a bowl. If multiple products are to be used simultaneously (eg bleach and developer), mix together.
- Apply to inner elbow of client and leave for an hour before washing off.
- Wait 48 hours before application of product to hair.
If a rash or any other adverse reaction occurs, do not use product on client.