craigy Posted February 27, 2019 Posted February 27, 2019 gorgeous looking coin until you turn it over, https://www.ebay.co.uk/itm/1950-UK-Great-Britain-Florin-Proof-Coin-George-VI-Coin-17-513-Minted/382515868873?hash=item590fb8f4c9:g:SqUAAOSwEUdaXWAR Quote
1949threepence Posted February 27, 2019 Posted February 27, 2019 17 minutes ago, craigy said: gorgeous looking coin until you turn it over, https://www.ebay.co.uk/itm/1950-UK-Great-Britain-Florin-Proof-Coin-George-VI-Coin-17-513-Minted/382515868873?hash=item590fb8f4c9:g:SqUAAOSwEUdaXWAR Definitely "detracts". What a super coin it would be otherwise. 1 Quote
VickySilver Posted February 27, 2019 Posted February 27, 2019 I haven't worked out the chemistry yet, but on copper-nickel coins like this submersion in a half-strength ammonia solution will tend to decrease the oxidation. It would be interesting to give it a go. 1 Quote
Peckris 2 Posted February 27, 2019 Posted February 27, 2019 Classic result of the horrible red card case of the 1950 proofs having an effect on (presumably) the side facing upwards. 1 Quote
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