L'Oréal Paris Colorista Hair Bleach lets you lighten all over, get gorgeous highlights, or create an ombre effect to customize your unique Colorista look. Bleach hair at home before you decide to color. Once your strands are lightened, get ready to play with Colorista Semi-Permanent Color! Bleach hair at home before coloring. Important: Hair color and bleaches contain ingredients which may cause allergic and/or other types of reactions. A skin allergy test is required 48 hours before each use of a hair color product. Bleaches contain persulfates. Bleaches and high-lift hair color shades cannot be used on relaxed hair; for other hair color shades, wait at least 14 days after bleaching, relaxing or perming before coloring. This is a safety summary. Read all product labeling and instructions completely prior to use.