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$\begingroup$ There is evidence that metallic taste might be caused by galvanic reactions or even specific receptors in the oral cavity. But I am not sure if this has already been proven in some way. $\endgroup$
– AstronAUT
Commented Sep 17, 2015 at 15:46
5

$\begingroup$ @AstronAUT: Good point. I should clarify that my answer does not mean metals have no taste in the formal sense. (A common trick to try to distinguish taste from smell is to simply hold your nose closed while tasting a substance. It's not perfect, because it doesn't seal the nasal cavity, but it certainly reduces circulation of the substance past olfactory receptors.) $\endgroup$
– feetwet
Commented Sep 17, 2015 at 15:55

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