Nordle11 Posted July 24, 2015 Posted July 24, 2015 Trying to figure out if this was a pre or post mint..It looks like it's been dipped maybe, but there aren't any other signs of this.Opinions greatly appreciated as always. Quote
copper123 Posted July 24, 2015 Posted July 24, 2015 sandblasted at an angle with high pressure sand or something else for a very short time? Quote
Nordle11 Posted July 24, 2015 Author Posted July 24, 2015 That's food for thought, actually.It's always good (not to mention fun!) to try and replicate post mint errors, even just to understand how they come about.But I have no idea where I'm going to get a sand-blaster to test that theory Quote
PWA 1967 Posted July 24, 2015 Posted July 24, 2015 Not got a clue ,maybe coppers is right and makes sense.Horrible coin though. Quote
Nordle11 Posted July 24, 2015 Author Posted July 24, 2015 Not got a clue ,maybe coppers is right and makes sense.Horrible coin though.Of course it is, but it's an error coin, not one for the main collection Quote
PWA 1967 Posted July 24, 2015 Posted July 24, 2015 Not sure if its an error mate if its post mint. Quote
Nordle11 Posted July 24, 2015 Author Posted July 24, 2015 Not sure if its an error mate if its post mint.No certainly not, that's what I'm trying to ascertain though.I do have some pennies with post mint 'detailing', we shall call it, but they are a small side section and mainly things like nicely engraved coins or things as such. Quote
VickySilver Posted July 24, 2015 Posted July 24, 2015 I concur with the acid and have seen very similar effect when high molar acid is used (e.g. nitric, hydrochloric) and there is a more pronounce "boiling" effect of metal off the surface. 1 Quote
Rob Posted July 24, 2015 Posted July 24, 2015 I has to be chemical. The legend shadowing is an expected result from acid based corrosion. The legend by definition involves a change in relief, i.e. you have metal flow to produce it, which will result in metal stress faults where the crystalline structure has been stretched. This will allow any acid to penetrate deeper and so result in a depression around each letter as the acid works more effectively in the stress faults. 2 Quote
Coinery Posted July 24, 2015 Posted July 24, 2015 There are some great acid images somewhere on this forum for comparison. They all show the increased erosion upon the stressed metal around the devices, as is mentioned above. Quote
Nordle11 Posted July 24, 2015 Author Posted July 24, 2015 Thanks chaps, and as always, thanks to Rob for a great explanation. I'll have to dig around for these pictures for comparison, thanks! Quote
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