Yes, if mixed equally, a 10V + 30V= 20 Volume developer.
Mixing 10 Volume developer and 40 volume developer will never make a 20 volume regardless of how much is mixed. In order to make a 20 volume, equal parts of 10 and 30 volumes will need to be mixed. Mixing 10 and 40 will make 30 volume.
NO. If you mix them in equal parts, that would give you 35 volume. To get 15 volume, mix equal parts of 10 and 20 volume.
20
10 minus -20 is 30.
30 - 10 k = 20
Yes, combining ''equal parts'' of 30 V. and 10 V. developers will make 20 V. developer.
Equal parts of 10 & 30 V. developer will yield 20 v.
Mixing 10 Volume developer and 40 volume developer will never make a 20 volume regardless of how much is mixed. In order to make a 20 volume, equal parts of 10 and 30 volumes will need to be mixed. Mixing 10 and 40 will make 30 volume.
It won't make it 30. The way developer works is 10 is no lift deposit only and makes hair semi permanent. 20 is 7-10 shades of lift with deposit and makes hair colour permanent. You have to buy 30 volume developer from a sallys beauty supply but 30 is very dangerous for the hair it can damage it severly I recommend sticking to just 20 volume
No, No you cannot. .... no you can't- but you can mix 10 with 30 volume! These strengths would equal 20 :)
Equal parts of 10 & 30 V. developer will yield 20 v.
mix 1 part of developer 30 with 0.5 part of water
in my time with color i found you can sometimes lift with a 30 volume if your hair is not too dark, the 30 will lift and deposit as to 20 and 10 only depositing the color.
20 or 30 Volume developer is recommended for blonding.
30 vol is stronger
Which developer you use will depend on the color you want to achieve. A 20 developer will give you a darker color than a 30 or 40 developer.
It won't give u exactly 30 more like 35 vol if u mix 20 and 40. If u want closer to 30 put a little more 20 then 40...