I'm specifically referencing Morgans (or Peace dollars), since I see the most colorful natural tones with them. But of course, any naturally toned coin applies. I'm sure that there are multiple ways these patterns can come about. Some of the more obvious ones I can figure out on my own. There are Morgans that are toned nicely when a coin(s) are stacked unevenly on top, creating a crescent shape. Then there's the bulls-eye toning that comes about via album or other holders. Then there's the fully toned ones without much of a pattern, but can come in an array of colors. But how about these below? And, maybe you have some others you want to share and explain how the tones developed? Thanks in advance! Pics from the 'net. 1. The Silver Cross Bank wrap with four "corners" bent in? 2. Striped Tape? 3. Sharp Angles Something left on top... but what? 4. The Warped Bulls-eye Diffused light at an angle through holder?
1. Yes it could be a bank roll with the corners wrapped 2. Yes tape or a cardboard holder 3. I don't know...maybe artificial 4. PCI holder...gas from the label
# 1 is most likely from rusty staples. If stainless steel staples are not used , the regular ones rust and since they penetrate through the mylar, the chemical reaction is spread to the coin. Here are some examples I have purchased.
That makes sense. The flips were probably stapled at the corners. The center of the staple would be closest to the coin, so it would travel further down the coin, creating a triangular shape. Neat.
The photos above are excellent examples of what stains look like when there are holes in the 2X2. While I have some ideas about the first coin, it is not caused by holes in the 2X2. The pattern suggests it is natural; however, that color deep blue color is often produced by heat.
2. Could be some sort of rubber-band as well. 3. ASEs just do weird things, yes even naturally and some very quickly. 4. Agree with the above that it is PCI holder toning.
baseball21, posted: 2. Could be some sort of rubber-band as well. IMO, no rubber band could cause this. Rubber turns silver black not blue.
There's never a hard fast rule for anything. A rubber band, band ect point was the strap didn't have to be tape
baseball21 posted: "There's never a hard fast rule for anything. A rubber band, band ect point was the strap didn't have to be tape." Actually there are! We both are going to die one day. Until then, here is another hard and fast one: That toning was NOT CAUSED by a rubber band. Or anything made of rubber. Period. I suggest members put a silver coin on rubber and see what happens. Let us know next year or you can speed up the reaction with heat.
