Which volume is the most commonly used in hair coloring?

The choice of 20 volume developer is commonly used in hair coloring because it provides the right balance of lightening and coverage. It lifts the hair color by one to two levels, making it suitable for standard dye formulations without excessively damaging the hair. This level of lightening is often ideal for most color treatments, especially when a more natural look is desired or when covering gray hair.

Ten volume developer is mainly used for depositing color without lightening, so it wouldn't be effective for significant color changes. Thirty volume developer offers a greater lift, which is beneficial for more dramatic changes but can also increase the risk of damage to the hair. Forty volume developer provides the highest lift, but it is typically reserved for specific technical applications where extreme lightening is necessary, as it can be very harsh on the hair. Thus, twenty volume is preferred for general coloring, balancing effectiveness with the health of the hair.