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20 Volume developer should be used when toning hair.
If mixed equally, you will get 30 Volume.
Equal parts of 30V + 40V= 35V.
Mixing equal parts of 20 V. and 40 V. developers will give you an approximate 30 volume developer.
Quick question how long do you let it sit there before doing the dye?
Mixing equal parts of 20 V. and 40 V. developers will give you an approximate 30 volume developer.
Equal parts of 30 volume + 40 volume developers= 35 Volume Developer.
Equal parts of 10V. Developer + 20V. Developer= 15 Volume Developer
What happens if you use to much hair developer to hair dye
30 volume developer is often mixed with bleach for high lift blonding. This mixture is very effective, but should be used cautiously if done by a nonprofessional. There can be serious side effects if left on the hair too long.
No you need the powdered bleach with the developer.
Yes, combining ''equal parts'' of 30 V. and 10 V. developers will make 20 V. developer.