The Bleach London Bond Building Bleach Kit contains anti-breakage technology scientifically proven to leave hair up to 30% stronger and lifts hair up to 7 levels. How to use: You must carry out a strand test on your hair before using bleach to check your hair's condition and how it will look and feel after lightening. Do not lighten your hair if the strand test feels damaged or you don't like how it feels. See test guide here. SECTION Divide hair into 4 quarters & secure MIX Mix up the bleach! SLICE & APPLY Take thin slices of hair & paint on the bleach SMOOSH! Coat every strand SCRAPE TEST Check the hair has lightened enough SHAMPOO Wash out the bleach.