Thioglycolate is one of the most important ingredients to understand in lash and brow chemistry because the percentage used affects how quickly and how strongly the formula works. It breaks disulfide bonds in the hair so the hair can be reshaped, but percentage alone does not tell the full story. Processing speed is also influenced by pH, formulation, and the condition of the hair. When you understand the chemistry, you start to recognize what you are seeing during processing, not just what step you are on. Click the classroom tab to learn the full breakdown of it's science, function, and how to identify when it is working.