Restoration of polished coins

Is the best way that leaving a hard polished coin to recover closer to its natural color?

By natural color, I mean something that has a chocolate-like feel.

I have seen people use repeated thin coats of olive oil and it has worked very well, but it does seem to take a long time.

Maybe It was the same principle as seasoning. So if you use oil that is more suitable for seasoning, the effect will be better...?,I thought 

Also,apparently you can also get a good color by soaking it in highly concentrated salt water and then letting it dry without rinsing.
However, I'm concerned about the damage that the salt can cause.

I think the best solution is to leave it as is, but if you have any tips, please let me know.

Target color

It should be possible to change the toning of copper coins by heating them. In practice, you can put the coin close to a flame (or electrical stove for example) and carefully move it around the source of the heat. After exposing it to the heat for some time, the copper would get dark toning, its colour depending on how long are you heating it and on the intensity of the heat.

I've only read about this method in an numismatic book though, haven't tried it myself . In any case, the colour change should be permanent, so I would first try this on really common coins. But if you want to keep the coin, it would probably look better than if it was polished.

Deda Lebeda

It should be possible to change the toning of copper coins by heating them. In practice, you can put the coin close to a flame (or electrical stove for example) and carefully move it around the source of the heat. After exposing it to the heat for some time, the copper would get dark toning, its colour depending on how long are you heating it and on the intensity of the heat.

 

I've only read about this method in an numismatic book though, haven't tried it myself . In any case, the colour change should be permanent, so I would first try this on really common coins. But if you want to keep the coin, it would probably look better than if it was polished.

Thank you！

I've done it, but not with coins.
It turns out black as you say.
But what I want to do is not hide the polish, but make it a natural color.
I'd be grateful if you've seen anything else or have any thoughts on the two examples I gave.

The color I'm aiming for;
*This is just a consideration, and I want to maintain the status quo

I use book aging toning, heres how to do it ; fold a,hvs paper, put the coin inside the folded paper and put them between an old book/newspaper (old book works best for copper, brass, bronze coins). Leave them for 6-12 months and you'll get the targeted color

CarlosRafael

I use book aging toning, heres how to do it ; fold a,hvs paper, put the coin inside the folded paper and put them between an old book/newspaper (old book works best for copper, brass, bronze coins). Leave them for 6-12 months and you'll get the targeted color

Thank you.This is easy way.

If you’ve tried it, I’d really appreciate seeing some photos.