Will a 20 Developer lighten hair?
20 to 30 minutes A boxed hair color that you buy in the grocery store often comes with 20 volume developer. It can lighten natural, undyed hair of 1 or 2 ...
The 20 volume developer opens the hair cuticle but unlike 10 volume, it provides lifting of the hair by one to two levels. ... The 40 volume developer is the ...