If anyone comes on here and says that gold has more solid (or softer, or whatever) tones, or different "fades", or certain numbers, etc.... then here's what you do: You invite those persons over to the nearest inner city blighted junky park, and turn them loose. See how many gold items they find, while passing even a tolerable percentage of aluminum junk. I bet that within 20 minutes, they cease making their claims. Truth is, gold can read all over the scale, depending on size, purity, etc... Size and density/shape play into it big time. 24k is actually a very high conductor. But no jewelers (in the USA anyhow) work in 24k (too soft). It's the alloys that make it a low conductor. And just like aluminum, it can read all over the scale. For example: take a snippet of an aluminum can (or simply take the tab). What does it read? Around nickel or tab or whatever, right? Now take the entire aluminum can and wave it. What does it read? Up at quarter or half, right? BUT WAIT! At no time did the composition change. In each case, each item was still the same metal: Aluminum. So what changed? The SIZE. Same logic for gold unfortunately. So if you want to up your gold vs aluminum ratios, you're going to have to go to places where gold is more condusive to losses, to begin with: Swimming beaches. NOT relicky sites or junky parks.