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Posted 02/28/2015 10:05 pm
CRH is for Coin Roll Hunting. In the Navigation box to the left, 4th item down is the Glossary. This is a great resource to use here to learn terms and abbreviations. I also highly recommend using the Search tool in the toolbar above (4th from the right).
The oil left by the finger on the coin surface does a couple things I think; penetrates the surface and collects dirt/dust. As the oil dries out, the deposits become attached thus leaving the fingerprint. I also suspect that acid that is present also etches the shiny surface. Once there and having attacked the substrate, the print is there rather permanently. Many coin hobbyists wear gloves for this reason to avoid putting a permanent mark on their collectables. Acetone within a minute or so of touching might reduce the overall impact, and why some folks will recommend giving a coin a bath before putting it into a flip.
The oil left by the finger on the coin surface does a couple things I think; penetrates the surface and collects dirt/dust. As the oil dries out, the deposits become attached thus leaving the fingerprint. I also suspect that acid that is present also etches the shiny surface. Once there and having attacked the substrate, the print is there rather permanently. Many coin hobbyists wear gloves for this reason to avoid putting a permanent mark on their collectables. Acetone within a minute or so of touching might reduce the overall impact, and why some folks will recommend giving a coin a bath before putting it into a flip.
Edited by Rackster
02/28/2015 10:09 pm
02/28/2015 10:09 pm
