Author Topic: 1943 Steel Penny  (Read 284 times)

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Online Figleaf

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Re: 1943 Steel Penny
« Reply #15 on: August 15, 2019, 08:53:19 AM »
The parallel hair lines are signs of harsh rubbing with unsuitable cloth. That is in general a bad idea, especially for machine-struck coins, as they have relatively large flat areas.

Washing a coin in a soft protective layer is OK for a coin that has no original metal colour left. Washing dissolves fat and softens mud but does not attack metal. It is better to wash the coin by hand and keep an eye on how it reacts, though. Washing will not remove chemical detritus and oxidation.

A soft eraser (the equivalent of harsh rubbing with a soft piece of textile or cottonwool) is OK for gold and works well on silver. The erasers on pencils are too hard. However, eraser rubbing changes the metal colour and attacks patina. The patina can be repaired with time, a process that can be hastened by exposing the coin to sulphur smoke (e.g. coal fumes or badly polluted air). The coin should be turned around from time to time to expose the other side. If the process is too quick, the patina can easily be wiped off again accidentally.

Peter
An unidentified coin is a piece of metal. An identified coin is a piece of history.