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What`s the difference between bleach and 40% peroxide? Printed From: HairBoutique.com Category: Hair Talk Forum Name: General Hair Talk Forum Description: A free wheeling discussion of hair related topics. URL: https://talk.hairboutique.com/forum_posts.asp?TID=5834 Printed Date: October 31 2025 at 2:35am Topic: What`s the difference between bleach and 40% peroxide? Posted By: tinkerblond Subject: What`s the difference between bleach and 40% peroxide? Date Posted: July 09 2002 at 11:21am I have used 40% peroxide on my head before with a very light blonde color and got it up pretty light.(I`m naturally dark brown). What is worse for your hair, 40 or double process bleach? What is the best way to get orange out of color put on roots to blend in with highlights? I don`t really want to go all the way,whole head,double processed bleach blonde. Can a colorist highlights roots he previously colored a dark blonde that turned gold rather than dark blond? I hate my hair,I`m ready to shave it all off!!!!!! Replies: