Dyeing red. Difference between 20volume and 40volume creme developer?

JamtinFrancis

New member
Im looking for a way to dye my hair close to a Haley Williams red without bleaching it before hand as my hair is quite thin and i don't want to damage it.

I found a youtube clip where this girl dyed her hair with
Loreal Color Excellence Hicolor HiLights (Red)
40 volume salon creme developer
http://www.youtube.com/watch?v=PWVwxjukxUo
.. its the sort of colour im aiming for.

At the moment my hair is a dark brown wine red colour from a previous box dye. My hair is natural a darkish brown.

I was wondering if anyone knows much about the difference between 20vol and 40vol developers when dying my hair red, and if will cause any damage to my hair
 
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