I've done quite a bit of recent research into copper and had been meaning to write about it. Some of my knowledge areas are a little quirky: I worked for a large copper producer when I was in my 20s and know a great deal about copper markets.
One set of numbers that I saw showed copper and copper(1) on par, and copper(2) substantially worse but still somewhat effective. That was just one study, though. Anyway, when brass gets green, hospitals are going to want to polish it, even if only to keep up appearances.
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Happy to read further references on this. Am using my phone, out of office, so my reference library not to hand. Brass is most likely to darken in indoor use. If green, something odd has been in contact with it. Regular handling keeps items bright, like this unlacquered pen.pic.twitter.com/MA9U5XIRdW
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I'm not sure which paper I read that in, and would have a hard time finding it again. It seems more appropriate to defer to your knowledge here.
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Be sure to check the test methods used in the papers you read. Look for ones where test parameters match real-life usage conditions (not wet broth or JIS Z 2801 or ISO 22196 tests). US EPA test protocols with 20 microlitre inoculum are more useful. See https://www.copperalloystewardship.com/antimicrobial-efficacy …
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