I think they're all clear or almost clear oils then, very nice white!!! I'm formulating today trying to accomplish a similar white to provide a good contrast for a lime green swirl.
I really like your yellow too. The contrast is very nice, and the color very pure. As long as it doesn't produce yellow bubbles I really like the degree of yellow that you achieved. What type of colorant was it?
Oh, and I wonder what kind of swirl that would have made!