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The general rule is to choose a hair color that is opposite from your skin's undertones. So, those with warm undertones might opt for a cooler hair color, and those with cool undertones should choose warm shades.What do the numbers on hair colour stand for?
Knowing a few things about how hair colour actually works will help you better understand the options presented to you at your professional hair salon. The first number is the base colour and indicates how light or dark the colour is. 1.0 is black, 5.0 is light brown, 6.0 is dark blonde, 7.0 is medium blonde and 10 is the lightest blonde.