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What is the difference between 20,30,40 volume developers?

What is the difference between 20,30,40 volume developers?

The most used formula or the ideal developer that one should consider while bleaching is 20 volume one as it has 6% peroxide. 

2.Oh!’s Hair Lightening Kit comes with a 20 volume developer which has a nice fruity fragrance which leaves the hair feeling soft, shiny and nourished. 

30 volume developer, also called as the developer with 9% peroxide, is frequently used with lighteners and will raise the hair up to a higher level, but causes a little more damage than 20 volume developer. 

Remember that 40 volume developers used with a lightener can be harmful, if used improperly.

Oh! Tip: Lightning Kit

The At Home Hair Bleach Kit is the perfect prelightening canvas for Semi Permanent Hair Color. Infused with bond-protecting Plex 2.Oh!, enriched with Argan Oil, and featuring Comfort Fragrance Technology, it offers a worry-free bleaching experience, creating the perfect canvas for our semi-permanent hair colors allowing you to embrace a spectrum of your dreams without fear.