While performing a chemical service, what indicates a need to halt the service?

Halting a chemical service is essential when there are signs of irritation or abrasions on the client's scalp or skin. Such indications can suggest that the client may have an adverse reaction to the chemicals being applied, leading to potential further injury or discomfort. It's crucial for the health and safety of the client to stop the service immediately in these situations to prevent any more serious reactions or complications.

Being attentive to these signs demonstrates a professional approach to client care and ensures the well-being of clients during chemical processes. Other changes or requests, while important to consider, do not carry the same immediate health risk as signs of irritation or abrasions do.