<prompt> The particle size in Williams E-Z Gold:15 mm10 mm12 mm20 mm  <response>: Powdered gold is made by a combination of chemical precipitation and atomization, with an average particle size of 15 mm. The atomized particles are mixed together in wax, cut into pieces, and wrapped in No.4 or No.3 foil.Several sizes of these pellets are available. This product is marketed as Williams E-Z Gold Ivoclar-Williams, Amherst, NY.Reference: Sturdevant operative dentistry. 7th EDITION, Page No:e68 