Create: Oxidized - Copper Oxidation with Create Mod
This datapack is specifically designed to work with the Create mod and adds a realistic method for oxidizing copper blocks, stairs, and slabs. Now you can accelerate the natural aging process of copper simply by washing it with water.
Important limitation: Only unwaxed copper blocks can be processed. If you've already applied wax to the copper surface, it will maintain its original appearance and won't oxidize when washed.