Marbling usually involves oil-based paints and turpentine. The end result is very effective, however, the necessary materials are not usually close at hand and cleaning up can pose some problems. Marbling with Powder Paint is easy and economical.
Mix a small amount of cooking oil with some FAS Powder Paint. A couple of tablespoonfuls of the mixture is enough. The proportions of oil to paint can be decided on and adjusted as the marbling takes place. Use a brush to shake drops of the mixture onto the surface of the water in the tray. Gently stir the water to mingle the colours.
Lay a piece of paper on the surface of the water to pick up the paint. Repeat the last step until the colour is fading, then add more paint to the water's surface.