Awesome silver cleaning method!

I think it's merely the mild acidity of spit. Maybe try a drop of white vinegar. Or a couple drops of washing soda and water, some sort of mild electrolyte. As was mentioned, it is electrolysis in it's simplest form.

I think the tin foil/aluminum foil thing is more an age issue. My, considerably younger than me wife, laughs at me when I say, "wrap it up in tin foil".
 
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Tin foil, also spelled tinfoil, is a thin foil made of tin. Actual tin foil was superseded by cheaper and more durable[1] aluminium foil after World War II. Despite this, aluminium foil is still referred to as "tin foil" in many regions.
 
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