Peter C Posted February 7, 2008 Share Posted February 7, 2008 GentsDoes any one know what the term "Acid Test" on US insignia means.With regard to jewellery I have seen the term used in reference to nitric acid testing of jewellery to see if it is silver.My thoughts are that it refers to insignia that is made from or is plated in silver that is less than 92.5% pure (Stirling).RegardsPeter Link to comment Share on other sites More sharing options...
John F. Posted March 20, 2008 Share Posted March 20, 2008 (edited) Does any one know what the term "Acid Test" on US insignia means?Hi Peter,Acid Test refers to testing of the finish in an acid solutions for quality. It does not indicate sterling silver, but the ability to resist tarnish to the gilding finish.Best,John Edited March 20, 2008 by John F. Link to comment Share on other sites More sharing options...
Peter C Posted April 1, 2008 Author Share Posted April 1, 2008 JohnI have just got back from a holiday in TasmaniaThanks for taking the time to reply to my post.RegardsPeter Link to comment Share on other sites More sharing options...
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