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<p>[QUOTE=&quot;2manybooks, post: 9438680, member: 8267&quot;]You can test for steel by using a magnet.</p><p><br /></p><p>I asked about the size because it might be a copper plate. There has been a limited tradition of painting on copper, though I would not expect it to be common in the 19th century. A small size would make this possibility a little more likely.</p><p><br /></p><p>I think you are going to have to find an expert on Gorbitz to see if anyone has documented his technique.[/QUOTE]</p><p><br /></p>

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