This section is from the book "Materia Medica And Therapeutics Inorganic Substances", by Charles D. F. Phillips. Also available from Amazon: Materia medica and therapeutics.
By triturating gold leaf with some hard crystals, as of potassic sulphate, or with some glutinous substance as honey; and after complete disintegration of the metal, the foreign ingredient is removed by washing - the resulting powder retains the color of the metal.
 
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