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ACID RAIN (SO2) FORMS CUPRIC SULFATE ON BRONZE<br />
After cleaning<br />
(2 of 2)<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.

Fphoto-18529009D-3DS.jpg

ACID RAIN (SO2) FORMS CUPRIC SULFATE ON BRONZE
After cleaning
(2 of 2)
Under clean atmospheric conditions copper forms an external layer of green copper carbonate -but the presence of SO2 in polluted air produces copper sulfate.

Copyright:© 1990 Diane Hirsch - Fundamental Photographs

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Diane Hirsch