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<p>[QUOTE=&quot;desertgem, post: 1645226, member: 15199&quot;]I do not think that any kind of organic material such as olive oil would have any beneficial effect on an object with &#039;desert&#039; or &#039;sand&#039; patina. Often these are formed not from the normal corrosive effects of the atmosphere, but by silicate formation on the surface of the metal, similar to a glass or ceramic covering, in that the main composition is clay ( quartz sand) like silicon oxides and alkaline oxides such as aluminum oxides that can harden without heating ( like ceramics and glasses). Some call these &#039;geopolymers&#039; . I suspect that physical action ( chipping, scratching, etc. ) the material off would be the only satisfying result. This type of patina is different from the &#039;corrosive&#039; conversion of coin metal to oxides or sulfur compound&nbsp; which might respond to olive oil, although I suspect verdicare would do better , IMO.[/QUOTE]</p><p><br /></p>

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