oxidisation with the 1.17 copper block should go in reverse in the end.

the end is a barren, alien wasteland where the laws of physics don't seem to apply. so what if copper, instead of oxidising, and weathering actually went from oxidised copper to weathered copper and so on, due to the strange and ominous weather.

if copper gets weathered it becomes useless, as in real life but it can also be reverse in real life with vinegar and salt. unfortunately we do not have vinegar and salt in Minecraft so this would be impossible.

but what if by placing oxidised copper blocks in the end you could effectively reverse copper oxidisation, making it useful again. this wouldn't be too overpowered as early game players would not be able to do this without going to the end. even for late game players it would take time for the oxidisation to be reversed.