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Hair coloring is the service during which it is most important to assess a client’s allergic reactions because hair color products often contain a variety of chemicals that can provoke allergic responses. Clients could have sensitivities or allergies to specific ingredients, such as ammonia or certain dyes, which can lead to serious reactions if applied without proper patch testing. In many cases, a patch test is recommended prior to the service to see how the client’s skin reacts.

While other services like shaving, haircuts, and beard shaping involve close contact with the skin, they typically use less reactive products compared to those found in hair coloring. Therefore, the risk of an allergic reaction is significantly higher during hair coloring, making it crucial to assess each client’s history with allergies or sensitivities before proceeding with the treatment. This precaution protects the client's health and ensures their safety during the service.