In the original file above, I indicated ZINC as "Zi", it has been corrected to "Zn". The corrected file lodges at my website, always available for download: www.Biblical-data.org/GSDykes_Specific_Gravity_tests.pdf
I've read your results several times, and the SG results for bronze, CuNi, and Al coins all seem to be within expected parameters. I should note, that most of your CuNi results are within expected values for this alloy. A few of the interesting results are the Mexican 1974-80 Pesos--a tad high, but maybe some base metal such as lead is mixed in? And XRF might shed some light on these coins. When I have time, I will cross-check some of these of these lesser-known alloys with the mathematical calculation for their specific gravity. Nice work!
I had to correct the first CuNi values, I copied them from some metallurgical website, and they are wrong. Thank you for pointing those out. The corrections are done (in the PDF). So do download the latest edition. I was very happy to see that the counterfeit Buffalo nickel showed up as such!! happy confirmations. Gary in Washington
I hope you have the final edition, it is at this link: www.Biblical-data.org/GSDykes_specific_gravity_tests.pdf All of the older posts are obsolete, the link above always has the latest edition!