Which of the following steps is NOT a part of the thermal sensitivity test for using hard wax?

The step that is not part of the thermal sensitivity test for using hard wax involves the practice of reusing a spatula to obtain new wax. In hair removal practices, particularly when dealing with skin sensitivity, it is crucial to maintain strict hygiene standards. Reusing a spatula can introduce bacteria from the skin back into the wax pot, which can cause skin irritations or infections for the client.

On the other hand, checking the comfort level, testing the wax on your wrist, and testing on the client’s wrist or ankle are all vital steps in assessing the temperature of the wax and ensuring the client's comfort and safety before proceeding with the hair removal process. Each of these steps helps in gauging how the wax reacts with the skin and allows for necessary adjustments to be made if the wax is too hot, ultimately prioritizing the client's well-being.