galba68 Posted July 19 · Member Share Posted July 19 Philip I Arab 15 Quote Link to comment Share on other sites More sharing options...
Al Kowsky Posted July 19 · Member Share Posted July 19 1 hour ago, galba68 said: Philip I Arab Green on billon 😉. 1 Quote Link to comment Share on other sites More sharing options...
MrMonkeySwag96 Posted July 20 · Member Share Posted July 20 I got a coin of Philip’s son with both green & red deposits 8 Quote Link to comment Share on other sites More sharing options...
shanxi Posted July 20 · Supporter Share Posted July 20 (edited) There are two reasons for this. The copper salt deposits come from the coin itself, as is possibly the case with the Philipi here, or they come from neighbouring bronze coins. In the latter case, with good silver, the coins can be easily cleaned with EDTA. The silver patina / toning is usually preserved with this cleaning method. (see example) In the case of billon, a rough surface sometimes remains after chemical cleaning. Edited July 20 by shanxi 5 Quote Link to comment Share on other sites More sharing options...
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