Step 2: Test Patch
Choose a small and inconspicuous patch of hair to be tested. Comb through a small amount of the Step 1 solution. You can cover it in saran wrap if you like- it makes it a bit easier to keep the hair held out straight, and it seems to accelerate the processing a bit. This isn't absolutely necessary though. Use the knot test to determine how long it needs to be processed. I used to have a great site listed here that had instructions and a video showing how to do it, but it got taken down sometime over the years. Boo.
Heres how you do it:
After about 5 minutes, take your treated strand, and tie it in a loose knot, just tight enough that you cannot see through the middle at all. Then let go. If your hair bounces and you can see through the center of your knot again, then it isn't done yet. Keep the solution in until the knot stays closed even after you let go. For me, this is about 30 to 45 minutes.
Wash out the solution and flat iron. Comb through a small amount of the Step 2 solution, let rest for 5 minutes, wash out, let dry, and check the condition.
If you have problems with breakage or are unsatisfied with the hair after this test patch is completed, DO NOT process the rest of your hair.
Make sure to record your processing time!!