What is the base for strong and fast-acting lighteners that may include powdered persulfate salts?

The base for strong and fast-acting lighteners that may include powdered persulfate salts is off-scalp lighteners. These lighteners are specifically formulated to be applied away from the scalp, often on sections of hair that require significant lifting. The inclusion of powdered persulfate salts in these formulas allows for a more potent lightening effect, ideal for techniques such as highlights or balayage. Off-scalp lighteners are designed to ensure safety and optimal performance, as they can generate a higher degree of heat during the lightening process, which accelerates the chemical reaction necessary for effective hair lightening.

In contrast, on-scalp lighteners are formulated to be gentle enough for application directly on the scalp and typically do not have the same strength or fast-acting properties as off-scalp lighteners. Developers are activators that work with lighteners but do not serve as a base themselves. Toners are used after lightening to balance or adjust the tone of the hair rather than to lighten it.