Metallic Flavors in Beer

Metallic flavors in your beers are perceived as the taste of a rusty nail, or coin-like, tinny and blood-like. One source of these off-flavors is from aluminum pots or other un-plated steel surfaces. High iron concentrations in the brewing water can account for some of these flavors as well.

When stainless steel is cleaned without passivating the surface (oxidizing to produce a layer of protective oxide on the surface) the unprotected steel can also cause off flavors.

Check the quality of your bottle caps, filter your water if necessary or use bottled water if you must, and keep all of your grain stored under proper conditions to prevent or reduce the coin-like off-flavors in your beer.

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