1991 Can. Nickel Discoloration? - Coin Community Forum

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Author	Replies: 6 / Views: 694
rasnajah New Member Canada 1 Posts	Posted 11/12/2023 1:24 pm Why is one side a different color? Reminds me of "tombac" one side...cheers Report this Post to the Staff

John1 Moderator United States 56855 Posts	Posted 11/12/2023 2:01 pm Report this Post to the Staff
DBM Pillar of the Community Canada 9700 Posts	Posted 11/12/2023 2:14 pm Environmental damage. Possible cupholder coin, 1991 are made of cupro-nickel, discoloration is very common with this alloy,. "Dipping" is not considered cleaning... -from PCGS website Report this Post to the Staff
Coinfrog Bedrock of the Community United States 94367 Posts	Posted 11/12/2023 10:22 pm to the CCF! Report this Post to the Staff
Errers and Varietys Bedrock of the Community United States 59749 Posts	Posted 11/12/2023 11:22 pm To CCF! I agree, environmental damage. PMD. Errers and Varietys. Report this Post to the Staff
jbuck Moderator United States 164408 Posts	Posted 11/13/2023 11:50 am to the Community! Coin Collector Since 1978 My Avatar My Old Avatar My 7070 My Eisenhower Dollars CCF Members on eBay CCF eBay Search Engine Report this Post to the Staff
silviosi Pillar of the Community Canada 6244 Posts	Posted 11/13/2023 10:21 pm One side show me a dull Ni. Normal because the Ni over the time become Yellowish Dull. The other side a little bit redish it is eplained by the ionic composition : nickel's high electronegativity, which causes a loss of one electron in copper's d-shell (leaving 9 electrons in the d-shell versus pure copper's typical 10 electrons). Report this Post to the Staff
	Replies: 6 / Views: 694

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