Describe the two different types of color strand tests.

• A. Preliminary Strand Test (Pre Service): 24-48 hours before to determine color formula; Color Development Test (Processing): Monitors the color's progress during the actual chemical application to ensure even processing.
• B. Patch Test and Preliminary Strand Test
• C. Color Development Test and Patch Test
• D. Strand Test and Visual Test

Answer: (A)

The idea behind color strand testing is to predict how hair color will behave on a small sample before committing to the full service. The first type, the Preliminary Strand Test, is done 24 to 48 hours before the appointment to see how the chosen formula interacts with the hair, so you can adjust the shade or processing time if needed. The second type, the Color Development Test, is performed during the actual processing to monitor how the color develops in real time, ensuring even uptake and the right processing duration. Together, these two checks help you achieve a predictable, safe result.

The other options mix in tests meant for different purposes: a patch test is about checking for allergic reactions to dye ingredients, not about how the color formula develops, and a visual test isn’t a formal method for predicting color outcomes.