Some years ago I bought a 1960 short proof set of South Africa, Crown to Halfpenny, that was presented in a mint sealed clear soft pvc heat welded pack. The coins are still in the pack, and seem to be totally unaffected by the pvc. At the same time I bought a similarly presented proof set of Fiji with the .925 silver dollar, down to the bronze cent. The similarly sealed coins were enclosed in an electric blue velvet lined box. In this case, the coins have developed a blue tinge, but the pvc interestingly, has developed a strong electric blue colour from the velvet. I suspect that the blue colour of the coins has leached through the pvc.
Posted 08/05/2010 3:28 pm
