My late brother David Lorenzo spent his entire life collecting nothing but SLQs. He has a complete collection with prices all over the spectrum....
In January 2022 we will be consigning to Stacks/Bowers my late brother's (David Lorenzo) collection of SLQs. He basically collected nothing else...
See the Gurney book on the Portrait types
It's made of aluminum.
This Mathur paper is interesting - Mathur KNEW before hand the copper sources were DIFFERENT based on U.S. Mint historical records. Records exist...
Mathur etal.(2009b) demonstratedthat US cents from the nineteenth and twentieth centuryshifted from imported Cornwall ores and Michigan ores tothe...
Another cleaning coin thread in Coin Talk. I have been experimenting recently with ultrasonic cleaning and hydrogen peroxide. A small portable...
I have seen one or two papers on this idea. The first copper smelted was obviously the surface copper and these forms are generally called arsenic...
Even Dr. Freidus could not prove me wrong. They simply did not have the equipment, money & technology to produce finished planchets. Its basically...
I did alot of research on this when I was in C4 collecting U.S. Colonials. Based on my research I could not confirm even with the Higley's at...
No flow lines Joe Crotin. KOOL - Fakes. JPL
A combination of a stereo microscope review if to proceed then ultrasonic, H2O2, Freon TF derivative solvent mixture, EDTA (if necessary), camel...
Not bad but still prehistoric as compared to my proprietary cleaning method on copper, brass & bronze. P.S. Looking for a new challenge. This...
cplradar - YES. Particularly with copper alloy coins. JPL
Try a two week soak in xylene - if still no effect John Lorenzo Conservation to the rescue assuming you live in the U.S.. I accept this challenge....
My Ebay partner just bought $7,000 worth of slabbed coins. One of the coins was a PF69 Kennedy. Since I am not into this kind of coin or...
Any questions, concerns or comments? John Lorenzo Numismatist United States
Since I do constant archeaometallurgy reading and no more research being retired I did remember these facts. These were written in April 2017 but...
Princeofwaldo your prize is a free CD of my latest book. PM your address. John Lorenzo, Numismatist, United States
Columbia - specifically centering & collecting all the gold issues. The millionaires or well to do of the country. As per Dan Sedwick. In terms of...
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