Protective serum: Highly concentrated serum designed to protect hair from potential damage caused by bleaching, coloring, or perming services. For bleaching or hair color, add to the prepared bleaching mixture. For perms, rinse out the fixation, towel-dry the hair, and apply a mixture of protective serum and water. For smoothing, add to Phase 1 of the smoothing product. Avoid eye contact and rinse immediately if the product comes into contact with eyes. Never use the protective serum undiluted or unmixed. For professional use only.