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| | JAIC 1978, Volume 18, Number 1, Article 4 (pp. 19 to 32) |
 | | Verdigris, a basic copper acetate, and green earth, an iron-containing hydrosilicate, are equally represented among the watercolors tested—four each. |
 | | A copper green, in most cases probably verdigris, a basic copper acetate appears on ten fraktur. |
 | | The fact that many of the green areas have turned quite brown indicates the use of verdigris rather than copper resinate in those areas, since verdigris readily decomposes in the presence of water and heat to form a dark residue, cupric oxide, while copper resinate remains somewhat protected by the resinous medium. |
| aic.stanford.edu /jaic/articles/jaic18-01-004.html (3277 words) |
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