The color you see is from the fumes off the metal. As I said I had used bismuth (which will cause checking) but silver can give you the same effects. Although the bismuth does produce a much much more clear and sharp color. It doesnt seem to haze up like silver does when encased. Too bad that it doesnt like to transfer heat.
As for the shavings, just make them as fine/small as you can otherwise they will pool up and merge into each. you will have to build up the back of the marble kind of like when doing a vortex. I havnt specifically attempted this pattern too many times so you may have to work with it to get the spiral galaxy you were aiming for.
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