Patch testing timing for safe color service is best described as:

Patch testing timing for safe color service is best described as:

• A. Patch tests are performed after the service
• B. Patch tests are performed only if the client has a known allergy
• C. Patch tests are performed 24-48 hours before the service to identify sensitivities
• D. Patch tests determine color shade

Answer: (C)

Patch testing before a color service identifies potential sensitivities to dye ingredients by observing the skin reaction over 24–48 hours. This timing is chosen so any reaction is detected ahead of the appointment, allowing alternatives or adjustments if needed. Conducting patch testing after the service wouldn’t protect the client during application, and testing only for clients with known allergies misses new sensitivities. Patch testing is about safety and identifying allergy risk, not selecting a shade.

Patch testing before a color service identifies potential sensitivities to dye ingredients by observing the skin reaction over 24–48 hours. This timing is chosen so any reaction is detected ahead of the appointment, allowing alternatives or adjustments if needed. Conducting patch testing after the service wouldn’t protect the client during application, and testing only for clients with known allergies misses new sensitivities. Patch testing is about safety and identifying allergy risk, not selecting a shade.