Page 73 - Copper and Bronze in Art: Corrosion, Colorants, Getty Museum Conservation, By David Scott
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Sulfate
[S0 4 -]^eg/l
2
pH
F I G U R E 1.8 Stability diagram of the system Cu-S0 4 -H 2 0 with fog and rain areas
shown for urban atmospheres. Area A = atacamite stability; area Β = brochantite
stability. Although the diagram over-simplifies the actual situation, it does show that
brochantite should form in outdoor exposure and that antlerite may form in more
acidic conditions (Graedel 1987a) .
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