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Acid Patina

Acid Patina.  Any artificial coloring of metal in which an acid is employed. Because a large number of patina solutions are acidic, this is used for somewhat of a general – but inaccurate – term for all patinas. Those patina finishes for which acids are used in particular are torch finish and immersion finish techniques; torch where the acid is brushed on simultaneously with heating of the bronze with a blowtorch, and immersion patina where the object is totally immersed for a number of days. Among the 1,126 recipes for patina finishes listed by Hughes and Rowe in their 1983 work, approximately half are acid patinas.  See patina.


P6 {1983} Hughes and Rowe

excerpted with permission from

An Encyclopedia of Coin and Medal Technology

For Artists, Makers, Collectors and Curators


Roger W. Burdette, Editor

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