Green Silver? - Coin Community Forum

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Author	Replies: 7 / Views: 1,378
Scooby Due Pillar of the Community United States 4000 Posts	Posted 12/17/2010 11:56 am What has turned these coins into a green, turquoise looking hue? Could it be storage or PVC? Anyway to save them? Report this Post to the Staff

Maineman750 Pillar of the Community United States 3592 Posts	Posted 12/17/2010 12:39 pm I've seen PVC damage do that...not an expert,but passing on what I've seen. Report this Post to the Staff
biokemist6 Bedrock of the Community United States 12437 Posts	Posted 12/17/2010 12:42 pm That color is almost certainly an indication of PVC residue and it should be removed ASAP. However, the damage may have already been done, especially on the Bicentennial Ike. Acetone will remove the residue, just make sure you thoroughly rinse the coins in fresh acetone after the soak. Report this Post to the Staff
sel_69l Bedrock of the Community Australia 21786 Posts	Posted 12/17/2010 8:47 pm They have acquired a green tarnish from the leeching out of chloride compounds from the PVC, otherwise known as Polyvinyl Chloride. The green cast is hydrous nickel chloride NiCl2.6H20. A lot of nickel compounds are green. If it is a coin of very low value, and forever will remain that way, keep it like that. Green is my favourite colour! Yay! This is my 600th post! Edited by sel_69l 12/17/2010 8:49 pm Report this Post to the Staff
BadThad Bedrock of the Community United States 19930 Posts	Posted 12/18/2010 01:23 am Nice sel_691! It's a combination of things. Oxidation and the reaction with chlorine in a slightly acidic environment (excessive exposure to air/humidity). It doesn't look like the classic PVC problem which usually looks like a green blob, similar to verdigris, but it's related. Hope this helps! Lincoln Cent Lover! VERDI-CARE™ INVENTOR https://verdi.care/ Edited by BadThad 12/18/2010 01:28 am Report this Post to the Staff
BadThad Bedrock of the Community United States 19930 Posts	Posted 12/18/2010 01:25 am Note how nickel chloride looks in the spoon on the right side of the wiki page: http://en.wikipedia.org/wiki/Nickel(II)_chloride You have a thin layer. Lincoln Cent Lover! VERDI-CARE™ INVENTOR https://verdi.care/ Edited by BadThad 12/18/2010 01:27 am Report this Post to the Staff
BadThad Bedrock of the Community United States 19930 Posts	Posted 12/18/2010 01:29 am Nickel oxide is also greenish: http://en.wikipedia.org/wiki/Nickel(II)_oxide Lincoln Cent Lover! VERDI-CARE™ INVENTOR https://verdi.care/ Report this Post to the Staff
BadThad Bedrock of the Community United States 19930 Posts	Posted 12/18/2010 01:30 am I've never tried it, but a dip in an acid-thiourea solution would probably make them like new. Good practice coins! Lincoln Cent Lover! VERDI-CARE™ INVENTOR https://verdi.care/ Report this Post to the Staff
	Replies: 7 / Views: 1,378

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