ion™ Ammonia Free Developer is specially formulated for use with ion™ Color Brilliance™ Ammonia Free Permanent Crème 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.
Always read the product packaging and inserts for complete directions, instructions, and warnings, and make sure to perform both the strand test and the patch test before applying your color.