1794 Carolus Llll - Page 3 - Coin Community Forum

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Author	Replies: 34 / Views: 7,724	Page: of 3

Bamboo New Member Malaysia 39 Posts	Posted 01/13/2011 9:09 pm Swamperbob, can you suggest an instrument that I can buy to measure density / specific density for metal / alloy / coins.( I want to measure my other collections too). Otherwise I have to conduct experiment "Archimedes style" to gauge the density of the coin. And I think it won't be accurate because the volume of water displaced will be small so much so even droplets of water loss ( due to wetting of catchment container/ surface)will significantly altered the result. Report this Post to the Staff
Bamboo New Member Malaysia 39 Posts	Posted 01/16/2011 9:09 pm Dear All, This coin is unlikely to be a Modern China forgery because it was kept by previous owner for couple of decades. I have asked the former owner of my Carolus III coin about the suspicious diagonal marks on the edge of my coin. This is his answer. It is a practice (bad one) by some to use a FILE tool to scrape the edges & collect some silver dust in order to test for the authenticity of the coin. Report this Post to the Staff
swamperbob Pillar of the Community United States 5362 Posts	Posted 01/16/2011 11:19 pm The diagonal marks in question are not produced by a file - at least the ones I own. The diagonals are grip marks and can be identified by a lack of scratches running horizontally in each diagonal line. The explanation given is correct for some forms of silver theft but not in the case I am pointing out. It typically is visible on only HALF the edge. Specific gravity is tested by weighting the coin in air and then in water. The difference in the 2 weights is the VOLUME of the coin expressed in cubic centimeters (1 gram equals one cubic centimeter). The SG is the result of dividing the weight of the coin by the volume. Report this Post to the Staff
Bamboo New Member Malaysia 39 Posts	Posted 01/17/2011 7:40 pm I think I know what instrument can be used to perform this test. Newton Spring Scale. Report this Post to the Staff
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