The step 1 lifting lotion breaks down the hair bonds so the brows can be reshaped.
Here are the recommended timings but please check hairs every 2 minutes to ensure you do not over-process:
Thin / Sparse Brows:
4–6 minutes
Normal Brows:
6–8 minutes
Thick / Coarse Brows:
8–10 minutes
 
Ingredients:
Aqua, Thioglycolic acid, Ethanolamine,
Cetearyl Alcohol, Sodium Coceth-30
Sulfate, Dimethylbenzyl Carbinol
Ammonium Hydroxide