Will a highlift (joico) work with a double 20vol instead of 40vol? Only needi g a couple levels of lift and thats all i have
Do you mean double the quantity? If so, then I would advise against that because it will have a diluting effect. With 20 volume, expect 1 or 2 levels of lift at best. Developer is pretty cheap, so if you can, just pick up the correct volume.
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Thank you for replying but The instructions call for double the developer since its highlift....question is if it will work with 20vol instead of 40? My fault for not wording original questions properly