Add small amount at first then mix. The more you add the deeper the color. Mix dyes for new colors by dripping a few drops of different colors and then mixing epoxy. We have found that 6-8 drops per 5ml of epoxy is a good amount. If you add too much dye the epoxy will not harden properly. These do not work well added to alcohol or dripped on top of epoxy as the dye doesn’t mix and will not fully dry.