Patch Test (Predisposition Test)
Category: lifestyle
A safety screening where a small amount of chemical dye is applied behind the ear to check for allergic reactions.
The patch test is a legal and safety mandate performed 24–48 hours before an operational color service. It screens for contact dermatitis or dangerous systemic reactions to compounds like paraphenylenediamine (PPD) found inside permanent hair color lines.
Common Examples
- Our salon insurance mandate requires a documented patch test for every new client seeking global permanent hair coloring solutions.
- Failing to execute a patch test exposes the salon infrastructure to massive liability if a client experiences a chemical burn.