Copper alloys and copper are not only antibacterial but also toxic to humans in large quantities. Acidic foods in unsealed copper pots can lead to symptoms of poisoning if used regularly. Copper reacts with acid. A splash of vinegar on the countertop would ruin copper and brass. It’s soft and acid sensitive, so you wouldn’t enjoy it for long.
My kitchen counter in my (rented) house is copper, and I do like that it is antibacterial, however, you cannot cut directly on it as it would dent the soft metal and dull your knives. It is impossible to keep shiny. I like the patina it develops, but if you spill vinegar or lemon juice on it, you’ll get a bright patch. The metal is great for setting hot pans on, but if the bottom of the pan has any moisture, it will make a green verdigris ring on the bottom of the pan. All in all, beautiful, but not super practical for a working kitchen.
Stainless steel is preferred for industrial and heavy use surfaces for a number of reasons, but the primary one is durability. Steel is more difficult to dent and scratch, even in thin sheets, than an equivalent copper alloy. Stainless steel also requires less maintenance because it doesn’t rust (easily at least) and doesn’t tarnish. Brass oxidizes very quickly, and faster still when exposed to moisture. To protect it, you end up needing to wax the surface, which destroys the antimicrobial properties and defeats the purpose.
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