[james5239]

So i got copper acetate in a baking pan (i used it before for copper acetate) And i used a putty knife to get it off Now there is copper accumulating in those scratches.
Any idea why?

[Borek]

https://www.youtube.com/watch?v=2MawIDT5DFU

[Enthalpy]

You can understand it as electroplating if you wish - though it's probably not the conventional name.

Two distinct electrodes, of copper and iron, in a copper thingyate electrolyte, would already make a voltage in the proper direction for electroplating to occur if connecting them, without external power. So much, that an external circuit isn't necessary: a lone iron electrode gets a copper deposit.

This spontaneous deposition must be avoided if willing to build a primary or secondary battery: it corresponds to self-discharge. Not easy.