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# Aerugo, also known as verdigris, is the green "

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Manhattan#
Aerugo, also known as verdigris, is the green "bloom" visible on many copper items, and is produced, like iron rust, over the course of time by the exposure of the metal to the oxygen in the atmosphere.
a) visible on many copper items, and is produced
b) that is visible on many copper items, and which produces
c) visible on many copper items, and produces
d) that is visible on many copper items, and that produces
e) which is visible on many copper items, and which is produced

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