20 volume peroxide is correct. 30 volume is used to make hair much lighter as well as 40. but 10 volume … i have no idea what that’s for, i’ve never seen anything in a beauty shop that uses 10 volume. but yes, use 20. good luck!

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8N is considered light blonde but much darker than bleached to platinum… if you are using it on natural hair color then you must consider what your natural level is first ( i.e. natural chestnut brown hair is a level 3 or 4 with warm highlight using a level 8N with the correct strength developer will end up as level 6 or 7 redish brown/brassy) … store bought products can only lift natural pigment 3 levels at most but usually less… and using an N series ( N denotes neutral) then you are not being provided with any drabbing so the results will have red or gold ( brassy) undertones… if you are using over previously lightened hair then you may flatten out the color… if the hair is porous you can bet there will some drabbing as well
I think you should go to a colorist and have a consultaton before you make a mistake

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