Know your natural hair color before mixing.
Choose the right developer (10-40 volume) for the desired result.
Use complementary colors to balance tones.
Follow proper color-to-developer ratios (1:1, 1:1.5, etc.)
Mixing primary colors creates secondary shades.
Neutralize undertones with toners after lightening.
Mix colors to create unique looks like balayage.
Understand and balance warm and cool shades.
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Choose based on the desired longevity.
Always test a small section before full application.