From my notes, not experience, I have 1/2 to 2 oz to 16 oz oil or 1/2t to 1 oz. How percise is that? :rolleyes2 I think it really depends on the color and depth you want. They few times I used micas or powders, I took about 1t of oil and mixed it. Then added some soap from pot, mixed it, then added back to the pot. Some of the more experienced soapers will be by soon. Digit