You're confusing Hz with kHz. Aluminum and copper frequency is 50 or 60 Hz depending on your geographic region. Major gold frequency is 19.2 kHz, but that's a geographic variable, too. Rumor has it that Africa is a hot spot for 13 kHz and 48 kHz, maybe Carl's heard the same rumor.
As I explained in a prior post, the peculiarities of specific targets can throw off frequency calculations. For example cans that contain or have contained beer also "hit" at 19.2 kHz, maybe it's the golden color that skews it. Brown beers come in bottles, not cans, so I guess we'll never be able to test the "color skews it" theory. ......Hmmm.....I haven't seen Rainier Ale ("green death") in at least 20 years, don't think they make it any more. But back in the 1950's Pearl Bailey sang the radio ad that it really made her canary sing (great ad!), maybe the residue of green beer in a green can would make a metal detector beep? But wait, canaries are yellow, so is gold? This stuff is 'way too mysterious for the mortal mind to fathom! Maybe mortals should stick to simple stuff like theology or how to eat spaghetti.
--Dave J.
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