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High yellow/gold 2004 Lincoln cent..
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<p>[QUOTE="Circus, post: 3739067, member: 51195"]Here are 3 books/booklets that cover chemicals and what happens to assorted alloys used in coins.</p><p><img src="https://live.staticflickr.com/852/42812217754_e62201cab0_z.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><img src="https://live.staticflickr.com/1809/43529453711_0b011c7f65_z.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><img src="https://live.staticflickr.com/914/29657804168_5eae7c288c_z.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p>They all have sections on chemicals and their reactions on coins, and artificial toning of coins.</p><p>It is really patination of the metal, having done metal working, silver/copper smithing for more years than I care to count. There are books and a whole host if tube vid's on the subject. Some of the processes can be dangerous due to the chemicals invoked, but there are enough that used household cleaners and food stuffs. That you can p-lay with to your hearts content. Heat patina's also are easy to do. and only require some heat source and a watchful eye as to timing. The color changes do denote the temperature the metal is at and that is why it is repeatable. </p><p><br /></p><p>In the coin hobby the use of the word toning is used by the practitioners to give it an upgrade over the more common patina word which has a more widespread use and more people know the meaning of the word.</p><p>Since I do not collect coins and only tokens and medals, the attitude about cleaning tokens other than CWT's is not hard and fast. Tokens are made from the same alloys as coins so the same procedures and processes are used.[/QUOTE]</p><p><br /></p>
[QUOTE="Circus, post: 3739067, member: 51195"]Here are 3 books/booklets that cover chemicals and what happens to assorted alloys used in coins. [img]https://live.staticflickr.com/852/42812217754_e62201cab0_z.jpg[/img] [img]https://live.staticflickr.com/1809/43529453711_0b011c7f65_z.jpg[/img] [img]https://live.staticflickr.com/914/29657804168_5eae7c288c_z.jpg[/img] They all have sections on chemicals and their reactions on coins, and artificial toning of coins. It is really patination of the metal, having done metal working, silver/copper smithing for more years than I care to count. There are books and a whole host if tube vid's on the subject. Some of the processes can be dangerous due to the chemicals invoked, but there are enough that used household cleaners and food stuffs. That you can p-lay with to your hearts content. Heat patina's also are easy to do. and only require some heat source and a watchful eye as to timing. The color changes do denote the temperature the metal is at and that is why it is repeatable. In the coin hobby the use of the word toning is used by the practitioners to give it an upgrade over the more common patina word which has a more widespread use and more people know the meaning of the word. Since I do not collect coins and only tokens and medals, the attitude about cleaning tokens other than CWT's is not hard and fast. Tokens are made from the same alloys as coins so the same procedures and processes are used.[/QUOTE]
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