Developer opens up your hair shaft and allows color to deposit however, it can also lift or lighten your hair color at the same time. So that leads to different level of developers.
10 being the lowest level developer with the least damaging and 40/50 are the highest level with the most damaging to the point of breaking your hair off if you are not careful.
What is volume 10 peroxide / developer?
This is use to open up your hair shaft and allows a color to deposit without any lifting of your own color. So if you were to dye your hair from lighter to darker, 10 would be perfect.
What is volume 20 peroxide / developer?
However, if you are a brunette level 3 trying to dye your hair lighter by one or two shades, 20 volume would be better for you. Volume 20 will allow your hair to lift one to two levels lighter (see the hair level guide above, level 3 brown with volume 20 developer will take you to either a level 4 brown or level 5 brown, depending on the brand you use and your hair chemistry).
What is volume 30 peroxide / developer?
Use to lift hair two or three shades or levels (see the chart above). Level 3 brown will take you to Level 5 or Level 6.
What is volume 40/50 peroxide / developer?
Is use to lift up to six shades or levels, depending on the brand of developer. It is the strongest and can be very damaging if you don't know what you are doing. However, unless you are a professional, I would not suggest trying to lift your hair in one process. It is safer to use a lower level developer to gradually lift to a desire level over a period of a month, if you have Dark Brown hair like mine. I only use 40 with a high lift for maintenance and only leave in my hair for 10-15 minutes.
I use the Ion Sensitive Scalp developer from Sally Beauty.
I will be doing a video blog to show all the phases I did to take my hair from Dark Brown to Level 8 Blonde with Level 9 & 10 highlights.
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