Page 174 - Copper and Bronze in Art: Corrosion, Colorants, Getty Museum Conservation, By David Scott
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A
Β
G
F I G U R E 5. 3 Weight gain of copper samples exposed to 7 0 % and 9 0 % RH with a
variety of pollutant concentrations: , 0% RH with 76 ppb S0 2 , 0 0 ppb 0 3 , and
7
A
4
5
6
6
9
5
476 ppb S0 2 with 0 0 ppb 0 3 ; , 0 % RH with 9 ppb S0 2 , or 9 ppb S0 2 with
B
5
5 0 0 ppb of 0 3 ; and c, 0 % RH with 76 ppb S0 2 and 0 0 ppb 0 3 , or 76 ppb S0 2
9
4
4
with 5 0 0 ppb 0 3 (Strandberg and Johansson 1997a).
