Usually a layer of patina
is preferred for bronze coins (oxidization).
1 A good patina
2 An authentic (looking) patina
helps reassure collectors that the coin is authentic.
3 A patina
(oxidization layer) protects the coin.
Wanting to have bronze coin shine like a new copper penny (1 cent), is going to put the experienced collector on edge.
To an experienced collector it doesn't look "real." They just don't come that way unless someone has aggressively removed the patina
, or if there never was a patina
on it in the first place (because it is a modern forgery
). Generally the attitude is to do no harm. Part
of the way you know a coin is authentic, is that it has an authentic patination. But I don't think even that is a guarantee.
It is possible to craft attractive patinas for bronze coins that due to cleaning, need to be repatinated. But, it is an art and not something to be dabbled with. A bad patina
job probably looks worse than no patina
at all. If there is a patina
job for a coin, the observer has to ask themselves if it was an attempt to cover up a forgery, or is it just a bad patina