http://www.ncscoin.com/news/viewart...on-Showcase:-Chinese-1984-Panda-Gold-100-Yuan "Classic gold coins both from U.S. mints and around the world on occasion develop red spots known as copper spots or gold spots. Modern gold issues are not immune to the plague of the spots as we can see on this Chinese 1984 gold 100 Yuan Panda coin. The panda design, which changes every year with a single exception, are popular with numismatists today. Not popular, however, are gold coins with small red blemishes as what can be seen on this particular gold Panda. " Opinion: This is a pretty fantastic conservation method, and can bring to life many Pandas that have been affected by this. Some adventurous people may start looking for discounted red-dotted Pandas and give them a more profitable start! <click the link above and see the image comparisons>
NCS has always been able to remove red spots on gold coins. It is proven and reliable. Never shy away from buying gold pandas with red spots if you can send them to NCS for conservation. They often are sold for less because of the spots. However, some very very small spots may not be removable.
I think when they grade the Pandas they take it out of their sleeves, do some thingy magic stuff to clean the spots and then slab them.
Don't necessarily need to have them graded, you can just choose to have them conserved but most people go for conservation plus grading.
I'd prefer to have a toned coin, in its original sleeve, rather than an untoned coin out of its sleeve, ungraded. Pretty sure a lot of people on here would feel the same way.
