I do the same thing, only I do it after dilution. I usually make a gallon at a time, then pour different FOs/EOs into 8 oz. Boston Round plastic containers. For 8 oz., I warm the LS for 45 seconds in the microwave, add 2.5 mls or so of fragrance in, stir, then pour into the container -- sometimes I add food coloring, but not always. I add a drop of color to 10 mls water to thin it, then add by drops until it's where I like it.