thank you for all your help. hopefully I will walk around the coin show and see ngc or anacs and get their opinions some of my coins that I need "cleaned" are silver eagles that were not stored in air tight containers. my most expensive coin is a 1883 cc ms ?? and I am thinking to get it graded
you should take a picture of the coin in question and join the PCGS forums. Ask the experts there what they think. Very knowledgeable. They could even give you step by steps on how to do it yourself.
PCGS is not there. google PCGS show schedule. NGC has a restoration service. They may be there as they are based in FL. FYI- people pay extra for the gold and blue naturally toned coins. Lots more. At less than $500, PCGS restoration is probably too expensive for you. $25 + grading fees
most of my coins are far below 500.00 I am not a big fan of "toning " but the gold and blue tone's do look nice. I will be going to a coin show this week end (orlando) and maybe pgcs will be there as well as others.
PCGS Restoration will not remove original toning simply to make a coin white.
PCGS Restoration will never add toning to a coin.
In cases where PCGS determines that removing toning is necessary and desirable and will not detract from the coin, it may be done. This type of toning may be the result of improper storage, interaction with corrosive materials, or a stain due to an accidental spill.
PCGS has a restoration service. Depending on the value of your coin, I'd let them do it. What type of coin, yr, grade guestimate, and worth is it? If it's worth more than $500, I'd let them do it. Under that, take a stab at it. I would try on a test coin first that is worth melt. Rinse in acetone and let air dry. Don't rub it at all.
FYI - some people like the "ugly" black oxidation. It shows age and lets people know the coin hasn't been touched in many years.
trying to find an "acceptable" cleaning service to get rid of ugly black oxidation but not degrade the coins value. does a dip into silver polish result in "bad" cleaning?
they display their numbers every day on their home page. All you have to do is track them in an excel spreadsheet and make a few assumptions.