Why perform a patch or strand test before chemical services?

• A. To predict sensitivity and hair or skin reaction and ensure safe, even results
• B. To test for color shade
• C. To determine strand thickness
• D. To speed up processing

Answer: (A)

Performing patch and strand tests centers on safety and predictable results for chemical services. The patch test checks for skin sensitivity or possible allergic reactions to the product, helping prevent a harmful reaction after application. The strand test assesses how the hair will respond to the chemicals—how it lifts, tones, or changes texture—and helps determine the right processing time to achieve even results. These tests aren’t about predicting color shade, measuring strand thickness, or speeding up processing, which is why they’re essential for safe, consistent results.