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Not a worst offering but the description made me laugh https://www.ebay.co.uk/itm/305351932516?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=xf8Ge12iRhS&sssrc=4429486&ssuid=8C3Ke2o8R1i&var=&widget_ver=artemis&media=COPY">link

Why on earth would people do this? The melting point of copper is 20 degrees higher than gold, so there's a real danger of melting the gold. The copper salts will also have a higher melting point. The best you can hope for is to alloy the copper and gold, which are chemically miscible.

I've watched videos of people removing copper spots off gold with a torch. Seems to work, but not personally tried.

SOLD Dave Groom.

The acidity in olive oil is part of what gives it its pungent flavor. Besides, olive oil gets gummy, and can go rancid. I know for treating wooden spoons, cutting boards I use walnut oil, to avoid the rancidity and gumminess, but suspect it, too, is acidic, so would avoid on coins.

Also - that particular coin has been photographed badly as far as the lighting goes: a top grade 1934 should be a completely different colour; remember, they were mint treated with hypo so shouldn't be all bright and shiny beige.

At first I was inclined to agree but have looked at this piece some more. It actually might be a 66, and here's why: - the striations about the bust in the field are likely hairlines from die prep - the apparent abrasions in around hair, neck, brow, cheekbone which used to bother me with these later silver larger denominations florin, HC, and crown are actually in many instances planchet defects that were not fully struck out (planchets/flans are usually only very crudely finished and replete with many marks, abrasions, gouges, etc.) . There was an excellent recent writeup of this, but sadly I can not remember where it was & then I got to thinking and appreciate the veracity of it. - technical grade may well be a "66" However, the aesthetics are not there IMO for these or even other reasons, and so the coin ought to be relegated down a bit by "market grading".

Verdi-Care is just a protectorant. A type of oxidation preventative type sealant product with minimal cleaning capabilities. Its useful therefore in a post-cleaning operation to prevent further oxidation build-up due to chlorine and sulfur intrusion ... JPL

I have used a product called Verdi-care for spot treating, and debris removal on circulated coins, and it just did not work, as stated in the write up by the seller.