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Soak a piece of cardstock in water and spread on a table. Drop two or more metallic acrylic paints on it - just a few spots. The paints begin to spread. While the paper is still damp, mix gold poster paint in a spray bottle with water. Then spray this mixture onto the paper covering the whole paper. This leaves puddles on the paper. Use a heat gun to push the gold water anywhere you'd like, so that certain parts have a layer of gold whereas most of the paper is covered with a thin film of transparent gold.