Copper like Oxidation

You can add a procedure on each tick,

If random 0 to 1<x- Chances of it oxidising, eg. 0.5 would be 1 in 2 chance each tick, 0.01 is 1 in 100 each tick or an average of around 5 seconds, 0.001 is around 50 seconds on average, 0.0001 is around 6~8 mins, etc.

For example, we'll use it oxidises every 6~8 mins, or something like this:

if random 0 to 1 < 0.0001

replace block at x y z with (oxidised version of the block)

So for this, you'll need to make a new blocked called "oxidised copper gold alloy" or something like that, and put that into the procedure I just showed you. Make sure that procedure is in the "block update tick" trigger.

Sorry my reply was so late.

https://drive.google.com/file/d/1jBl6SoRmWo9Wfjqpw-lCAIVvknszWEbs/view?…

That's the image for the thing. Put the procedure on the "On block update tick" trigger. Good luck!