because it is made of a cheaper metal such as copper or brass (which is mainly copper anyway) and copper reacts with acid in your sweat and tarnishes. the green stain on your skin is that tarnish rubbing off on it.
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There are no cities in Oklahoma that begin with tur. There also are no towns in Oklahoma that start with tur.
Bob Tur was born in 1960.
Cop-Tur was created in 1983.
Arlene Tur is 5' 9".
In Irish there are tur and túr:túr is 'a tower';tur is 'dry/arid; cold/unsympathetic; dull/uninteresting
you pronounce it as "lat-tur". You pronounce the "tur" part like the "tur" in 'turf'.
One vegetable that starts with "tur" is turnip.
Diego Tur was born on 1971-10-03.
Gutta på tur was created in 1995.
Tur Turek was created on 1921-08-06.
TUR European Airways was created in 1988.