10 volume is if you want to go dark with color but with bleach 10 vol gives you one level of lift but if it seems slow to you use 20 volume, never use 30 vol or 40 vol on scalp it will irritate it.
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The difference between 10 and 20 volume developer is the strength or potency of the developer. 20 volume developer is stronger and lifts the hair color more effectively than 10 volume developer. The choice between them depends on the desired level of lift and hair color result.
You can mix equal parts of 20 volume developer and 0 volume developer to make a 10 volume developer solution. The resulting mixture will have an average volume of 10 developer.
To make 10 volume developer from 20 volume developer, you can mix equal parts of 20 volume developer and distilled water. For example, mix 1 part of 20 volume developer with 1 part distilled water to create 10 volume developer.
Mixing 1 oz of 20 volume developer with 1 oz of 10 volume developer results in an effective volume developer somewhere between 10 and 20 volumes. This blend may provide slightly more lift than a 10 volume developer alone but less lift than a 20 volume developer. It is important to consider the hair's condition and desired outcome before using this mixture.
Equal parts of 10V. Developer + 20V. Developer= 15 Volume Developer
It is not recommended to double the volume of developer to achieve the desired strength. Using a 10-volume developer when a 20-volume developer is needed can result in uneven hair color or ineffective processing. It is best to use the correct developer volume for the hair color you are using.