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<p>[QUOTE=&quot;Victor_Clark, post: 8293409, member: 10613&quot;]green (malachite) and blue (azurite) are both copper carbonates. A book I like on the subject of bronze patinas and corrosion is --</p><p><b>Copper and Bronze in Art: Corrosion, Colorants, Conservation </b>by David Scott</p><p><br /></p><p>[ATTACH=full]1466256[/ATTACH] </p><p><br /></p><p>&quot;Both malachite and azurite form as corrosion products principally when copper alloy comes into contact with soil waters or with water formed with surface condensation and charged with carbon dioxide.&quot; pg 108</p><p><br /></p><p>there is a lot more...but I don&#039;t want to ruin the suspense. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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