The surface tension of water causes flour gold to actually float on the water surface. This is something you do not want to happen. Floating gold particles are difficult to capture. Jet Dry, or commonly used automatic dishwashing detergent acts as a wetting agent and surfactant to reduce the surface tension of water. It allows the water to make greater contact with the gold. You have heard of the term "mesh size". Figuring out the mesh size is easy. Just count the number of openings in one inch of screen. The number of openings is the mesh size. 5 mesh screen means there are five little squares across one linear inch of screen. A 200 mesh screen has 200 openings, and so on. As the number describing the mesh size increases, the particle size decreases. Higher numbers equal finer powder. Mesh size is not a precise measurement of particle size. Screens can be made of different thicknesses of wire. The thicker the wires, the smaller the particle size passing through that screen, and vise versa. What do the (-) and plus (+) signs mean when describing mesh sizes? -100 mesh gold means that all the particles are retained on a 100 mesh screen.
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