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acid test


Peter C
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Gents

Does 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).

Regards

Peter

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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 by John F.
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