HOW LONG SHOULD I LEAVE THE BLEACH ON?

The length of processing time depends on the color and condition of your hair, but we don’t recommend leaving the bleach on for longer than 40 minutes per session. While processing, make sure to check your hair every 10 minutes after the application to evaluate how much color has lifted. To do so, wipe away some of the bleach in the area you want to check with a damp paper towel and re-apply bleach as needed to the small spot, and continue processing. If you feel burning or discomfort in any way, wash bleach out with shampoo immediately (making sure to avoid eyes and face). Never apply bleach more than once back to back.
WARNING: DO NOT LEAVE ON LONGER THAN THE RECOMMENDED TIME.