I have a 1990 Kook in it's original capsule that's tarnished heavily around the edges (not very airtight I guess!). Personally, I prefer shiny bullion...but would this ruin it's "collectors" value?
Do not clean Perth mint coin's, ever Otherwise why not just send it to get re-melted, don't do that, its only a little bit dark
Drop in hot water with bicarb on aluminium foil and watch the black disappear in a few minutes. Rinse and pat try with absorbent paper towel. Don't rub. Cannot see how that would impact the coin as you are not scrubbing or polishing at all. I too prefer the all-over shiny look.
Just the whole thing sounds so bad for the coin. Like when you drop it onto the aluminum (which is metal) will possibly put small scratches on the coin, handling the silver with your bare hands (hand oils) you may also know that china makes a crap load of fakes, also perth mint has re-struck the kooks, so the tarnish is kind of another way of spotting a fake or a re-strike, so I don't fully understand why people would want to clean a numismatic bullion coin. But I do prefer my bullion shiny TBCH, I just would not dare open the PM capsule IMHO if you want to clean an old kook, don't, just sell it here on silver stackers and get a re-struck kook instead.
1990 Kooks weren't restruck - the full run of 300,000 were minted that year. Presumably there's been substantial population shrinkage over the years. I would never clean a 1990 Kook. Even toned they still attract very good premiums over spot - and because of the capsule lack of seal, i reckon 99% would have significant edge toning. Key date for a collection. Bicarb method will scratch a coin like that with mirror surfaces, and render it bullion.
I wonder if the foil and bicarb deal would be ok for some slightly tarnishes PM 10oz cars? no real intrinsic value past the brand and size.
i have noticed direct sunlight on thermo plastics tarnishes silver and even copper and cupro nickel coins to a lesser extent within a year. I lost a stack of RAM Rolls that had been containered for individual sale. and a few hundred 925 chains. left hanging in the sun/. I renewed the chains sparkle with bicarb and aluminium. Shiny sells, dull brown ugly sells for less. in any commodity. They are all stored in the correct modern plastics for coins too. the stuff in the shade is still spot on. cleaning on the kook? unless its ugly.. dont.
