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Dark colours increase the flip effect but make the colours darker - with the black base coat the colours go from greeny yellow through bronze to purple rather than red to gold, which I suspect it would with a white base. Next experiment is going to be navy/plum flip over a silver base. No idea what it will look like. Basically, I've no idea what I'm doing really. Just playing with paint. It's all good.
Do different colour basecoats influence the range of colours you get from flip paint, or do they specify what you should use underneath (or else it doesn't work)?