Middle Age. In 16th Century an aqueous form of colloidal gold called “Aurum Potabile” (drinkable gold) was discovered in Europe which was thought to have curative properties for many diseases (Caseri 2000). In 1915, Wolfgang Ostwald, in his famous book “The World of Neglected Dimensions”, recognized colloidal particles as “so small that they cannot be recognized microscopically, but they are still too large to be called as molecules.” However Richard P. Feynman is the person to whom the credit is…
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