Average particle size of powdered gold is:: (A) 10 μm, (B) 15 μm, (C) 30 μm, (D) 0.1 mm
Answer is B. A fine powder is formed by chemical precipitation or by atomizing the metal. The particle sizes vary (average 15 µm). The pellets are mixed with soft wax (0.01% organic wax, which is burnt off prior to use) and then wrapped with gold foil (No. 3), rather than sintering the mass, like for mat gold.
Ref: Basic Dental Materials 4th ed page no 160