Uneven Toning On 1970 Proof Penny - Coin Community Forum

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Author	Replies: 7 / Views: 1,335
stliboire Valued Member Canada 68 Posts	Posted 09/20/2017 1:46 pm I've acquired several proof 1970 coins recently, and this one is in a set. I notice that the 'toning', if that's the right word, is uneven: the centre seems lighter than the rest. Is this common? What has caused it? Thanks. Report this Post to the Staff

usdollar75 New Member 35 Posts	Posted 09/20/2017 2:32 pm Nice found Report this Post to the Staff
moxking Rest in Peace United States 17900 Posts	Posted 09/20/2017 2:39 pm It was kept in a container of some type that touched the periphery but not the center of the coin. Report this Post to the Staff
stliboire Valued Member Canada 68 Posts	Posted 09/21/2017 07:48 am It's still in the original plastic case with its siblings. Report this Post to the Staff
DavidUK Pillar of the Community United Kingdom 2624 Posts	Posted 09/21/2017 08:36 am Surely it is just oxidisation where air has got to it (working from the outside inwards towards the centre.) How do the others look? Is there a half penny there to compare, does this match the inside or the outside colour of the penny? Report this Post to the Staff
stliboire Valued Member Canada 68 Posts	Posted 09/21/2017 12:23 pm The half penny also shows a similar pattern but less obvious (smaller area of paler colour). Report this Post to the Staff
DavidUK Pillar of the Community United Kingdom 2624 Posts	Posted 09/21/2017 1:42 pm I think moisture/air has seeped in there then and oxidised it. Report this Post to the Staff
NumisRob Bedrock of the Community United Kingdom 17965 Posts	Posted 10/11/2017 03:17 am I've seen several 1970s UK proof coins like this in their original casing. The toning starts around the rim and gradually spreads towards the centre of the coin. My Trade List: https://goccf.com/t/194596 My Wants List: https://goccf.com/t/191710 Report this Post to the Staff
	Replies: 7 / Views: 1,335

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