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!

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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