Maybe somebody who uses the same type of dye as you can chime in with better advice than I can give. I use TKB's Lavender Liquid Concentrate. The label on my 1/2 oz bottle states - "Recommended Dosage: 1 floz per 20 lb of soap". I've made about 5 lbs of soap with it so far (both clear and opaque), and the bottle is still really full (almost at the top). Unfortunately I can't remember the specific amount of drops I added per lb. I eyeball it, but I know I'm well within the recommended dosage, otherwise it should be half gone. Does your bottle give any specific instructions?