Standard mixing ratio is 1:1.5, however for resistant gray coverage mix 1:1. All instructions are based on average hair texture. If the hair is fine or coarse adjustments should be made accordingly. Fine hair is more receptive to hair coloring where coarse hair is not. ion Ammonia Free Developer is specially formulated for use with Ion Color Brilliance Ammonia Free Permanent Creme Hair Color. ion Developer is available in 2 volumes, 18 and 32 for formulation customizations. Use 18 volume for tone on tone deposit or up to 1 level of lift. Use 32 volume for 2-3 levels of lift.
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