Hi I am new to this forum I have a question about an uncirculated 100 soles which got a white spot over its left arm Now I have seen red spots and green spots but not a white yet could it be silver ?
Hi, and welcome to the forum ageka. The reason I split your posting off into its own thread is that your lovely gold coin deserves its own thread, rather than being a tag-a-long to someone else's. When I looked at your picture my first thought was corrosion, but that was before I realized you have a low mintage KM#231 .900 gold coin that couldn't very well have corroded. Frankly, My guess would be some kind of foreign substance, but without seeing the coin in hand, it's pretty tough to tell. The 11,000 mintage at Lima is the second highest year for the type, and catalogs at bullion value (~$550 currently) in XF, $600 in Unc. and $700 in BU. How about posting a picture of the reverse for the enjoyment of the group?
I have seen several coins that had green spots from copper corrosion I only bought 4 from that series which were spotfree Looks like the copper got not mixed well in the planchet Attached one of the coppery 20 marks gold 1906 So I thought maybe the spot on the 100 soles is badly mixed in silver since my fourth edition Krause does not say wether copper or silver are used to get 0.900 I presume it is silver
Actually it is generally assumed that in a gold alloy the other metal is copper, unless something else is specified.
Now if that white spot wer eon a silver coin I'd know how to explain it - but on a gold coin I may have to agree with satootoko on this one - foreign substance. But just in case - might I suggest you weigh the coin.
I asked today the advice of a jeweller He thinks some moron used testing liquid to determine it is 900/1000 of gold
