Between 2.5 and 5% depending on the brand.
Keep in mind that the bleach is very much diluted usually about 1/2 to a full cup in an entire bath tub.
the only other way to get your hair completely blond is to professionally dye it (eve n then they might bleach it...)
No, you cannot.
DON'T do it.Household bleach is meant to clean and disinfect things, not change the color of your hair. Household bleach is extremely caustic and will damage and burn your hair off. If you want your...