Which step is part of performing a 1:20 test?

• A. Mix 1 ounce (30ml) of 20 volume peroxide and 20 drops of 28% ammonia in a glass bowl
• B. Mix 2 ounces of 20 volume peroxide with 20 drops of ammonia
• C. Dip hair for 60 minutes
• D. Rinse with water and air dry

Answer: (A)

This test measures how hair will respond to the chemical action in a perm by creating a small, controlled sample with a precise chemical mix. The 1:20 test uses a specific combination to mirror the conditions the hair will endure during processing, so you can observe the rate and extent of the reaction on a strand before treating the entire head.

The best choice uses exactly the defined mixture: one ounce of 20-volume hydrogen peroxide with twenty drops of 28% ammonia in a glass bowl. This combination creates a compact test solution that reflects the processing environment, allowing you to gauge how long the hair should process and whether adjustments are needed. The other options either propose a different mixture or describe post-test steps such as rinsing or drying, which aren’t part of performing the 1:20 test.