I have 7M Mahogany Blonde (which is not at all blonde, it's more auburn and it's not light) and the developer I picked up is 40 volume 12%
Will this be okay?How do you know which Vivitone hair color developer to use?
40 volume is WAY to high,40 is used mainly in bleaching and lifting ethnic hair...you should only need a 20 volume for your needs.
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