DPerdue Posted October 20, 2022 · Member Share Posted October 20, 2022 How does NGC determine "Altered Color"? I recently go this Korean coin back from NGC. 2 Quote Link to comment Share on other sites More sharing options...
expat Posted October 20, 2022 · Supporter Share Posted October 20, 2022 It is a form of altered surface or un-natural toning. Your example looks to have been subjected to a chemical or heated in an oven sometime in its past. 2 Quote Link to comment Share on other sites More sharing options...
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