It's 100% true for copper. Not sure about brass but more plausible than you'd think
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"In this study, human coronavirus 229E was rapidly inactivated on a range of copper alloys (within a few minutes for simulated fingertip contamination) and Cu/Zn brasses were very effective at lower copper concentration" https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4659470/ …
End of conversation
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