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ACID RAIN (SO2) FORMS CUPRIC SULFATE ON BRONZE<br />
Copper II Sulfate (CuSO4)<br />
Union Square Park<br />
Under clean atmospheric conditions copper forms an external layer of green copper carbonate -but the presence of SO2 in polluted air produces copper sulfate & black, gritty cupric oxide.

Fphoto-18798704A-3PS.jpg

ACID RAIN (SO2) FORMS CUPRIC SULFATE ON BRONZE
Copper II Sulfate (CuSO4)
Union Square Park
Under clean atmospheric conditions copper forms an external layer of green copper carbonate -but the presence of SO2 in polluted air produces copper sulfate & black, gritty cupric oxide.

Copyright:© 1987 Paul Silverman - Fundamental Photographs

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Paul Silverman