A skin patch test helps determine what aspect of client safety?

A skin patch test is primarily used to assess whether a client has an allergic reaction to a specific product or ingredient. This is critical for client safety, as allergic reactions can lead to various adverse effects ranging from mild irritation to severe skin responses. Conducting this test prior to applying products, especially those containing chemicals like hair dyes or other hair treatments, helps ensure that the client does not experience any harmful reactions during or after the treatment.

The other options do not pertain to the purpose of a skin patch test. Preferences for colors are related to personal choice rather than health and safety. Hair loss is a separate issue that requires different assessments, and special care requirements are typically determined by other medical conditions or considerations rather than an allergic response. Thus, the focus of a skin patch test is solely on identifying potential allergies, underscoring its importance in promoting a safe and tailored experience for the client.