Gold Bulletin

, Volume 9, Issue 4, pp 134–139 | Cite as

The true story of Purple of Cassius

The birth of gold-based glass and enamel colours
  • L. B. Hunt
Open Access


For the past 300 years the literature on gold, on glass and on ceramics has ascribed to Andreas Cassius the credit for discovering the purple preparation of colloidal gold and slannous hydroxide that bears his name and that is still in use as the most effective means of producing enamel colours ranging from pink to maroon. But not only was it known and described more than 25 years before its publication by Cassius; it had already been successfully used to produce a beautiful ruby glass.


Ruby Potassium Silicate Gold Chloride Glass Factory Gold Powder 
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Copyright information

© World Gold Council 1976

Authors and Affiliations

  • L. B. Hunt
    • 1
  1. 1.Johnson Matthey & Co LimitedLondon

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