Mark Stilson Posted February 5, 2006 Report Share Posted February 5, 2006 It may be a little hard to see. But wondering on the 1798 copper it has a blue metalic tint to it. Is that a sign of chemical cleaning? http://www.omnicoin.com/coin_view_enlarge.aspx?id=908276 Link to comment Share on other sites More sharing options...
jlueke Posted February 5, 2006 Report Share Posted February 5, 2006 Copper sulfate is blue. So it is more likely a sign of being stored in paper or in an industrial atmosphere. Overcleaning copper with acids tends to lead to a pinkish color. Link to comment Share on other sites More sharing options...
Art Posted February 5, 2006 Report Share Posted February 5, 2006 What Jorge said --- Just an additional point. On the early US coppers the original planchets were quite a mixed bag. The US Mint was not able to secure premade planchets and so most were made at the Mint. In many cases remelted copper was used. The copper may have been from cooking utensils or door/cabinet hardware and such. Because of this the alloy is far from exact. Coloration is all over the place. So is prestrike damage. Link to comment Share on other sites More sharing options...
Burks Posted February 5, 2006 Report Share Posted February 5, 2006 On a side note, nice looking 1798. Those are hard to find in any condition. Link to comment Share on other sites More sharing options...
Mark Stilson Posted February 5, 2006 Author Report Share Posted February 5, 2006 On the color I was also worried about possible 2x2 storage problem. It was in an 20 years old 2x2. Took it out water washed and in a new one I just got. Good enough? (BTW I'm doing that with all my coins.) Link to comment Share on other sites More sharing options...
AuldFartte Posted February 5, 2006 Report Share Posted February 5, 2006 Okay, please don't wash with water unless it's distilled water. Regular tap water has chemicals and stuff in it that can lead to damage of the surfaces of coins, especially copper. If you want to remove biological "gunk" that has built up in the nooks and crannys, soak it in Acetone for a few minutes, rinse in more Acetone (not the stuff you just soaked it in), and leave it alone - it will air dry rapidly. If you must rinse it with distilled water, do it after the Acetone rinse and gently pat it dry or use a hair dryer or something that will dry it rapidly. Link to comment Share on other sites More sharing options...
Art Posted February 5, 2006 Report Share Posted February 5, 2006 What AF said. Plus+++++++ Many Large Cent and Half Cent collectors keep their coins in cloth sacks in acid free 2x2 envelopes. I'm out of the envelopes but I'll be happy to send you a cotton sack for your large cent. PM your mailing address. Link to comment Share on other sites More sharing options...
Mark Stilson Posted February 6, 2006 Author Report Share Posted February 6, 2006 De-ionized water work? It's what we use at work to fill batteries with. Filter and No minerals. I know a lot of the drinking/distilled water may not remove minerals or actualy add for "taste". Well at least I have not gone very far on them. Been real slow start on the re-organization of my collection. Art appreciate the offer but does the bag need to be anything other then just 100% white cotton cloth? I'll drop by the coin shop and pick up some 2x2 envelopes. Might as well start remaking friends with the local coin shops. Another thing I was wondering the regular mylar ones are a problem? Also should I be doing that on the other large coppers? Edit BTW I really appreciate the help on this. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.