What is the correct procedure for testing the temperature of wax?

Testing a small amount of wax on the wrist is the correct procedure for ensuring the wax's temperature is safe for application. This method allows the cosmetologist to assess whether the wax is too hot and could potentially cause burns or irritation to the client’s skin. The wrist is a sensitive area that can provide a reliable indication of the wax's temperature without exposing the client to risk.

Using a thermometer may provide an accurate measurement, but it is less practical in a busy salon environment where quick assessments are often needed. Applying wax directly to the client or simply checking its runniness does not adequately ensure safety, as both methods run the risk of causing discomfort or injury. Therefore, testing on the wrist is a preventive action that prioritizes client safety and comfort.