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[–] theMETA 0 points 2 points (+2|-0) ago 

Yup. Brass is a copper-tin or copper-zinc alloy, whereas bronze is usually a copper-aluminium alloy.

The problem with this comment thread is that most brass door knobs are coated in a thin, "invisible" plastic to prevent it from oxidizing. This keeps the brass bright and golden, instead of turning brown and "crusty."

This plastic barrier prevents any antibacterial properties the copper could possibly have. For this reason, brass has been primarily used for its golden color, and not it's antibacterial properties.