I usually just take a small scoop, put it in whatever I am going to use for swirl (disposable cup, small pitcher, whatever) and mix it with some oils. I always mix oxides with oils, someone told me that long ago, so that is how I do it. I use that small amount of oil, mix it up so there are no clumps, then when I have emulsion, I scoop off a small amount for swirls and put it in the mix. Does that make sense? Or do I need to go to bed? If you are looking to color your base, I always just take out some uncolored portions to swirl first.