What happens if you mix two different brands of hair dye?

6 years ago

Above image not my own, see source link.

Okay, so my hair is really really really thick and really long so i have to use 3-4 boxes of hair dye (Ridiculous, i know)
I was just wondering what would happen if i used the same colour but in different brands? Would a bad reaction or anything happen or is it safe?



Source link: http://www.suvarna.co.uk/user/Hair%20colour%20powder%20shades.jpg

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