Got a Eweadn mechanical keyboard and I really like it. After months of use, however, this greenish teal/turquoise stuff accummulates on the keys I use the most. It also accumulates on the sides of the keys, and it doesn't clean off easily. It seems to originate between the circular cap and the rose-gold plated rims. What is?
I apologize if this isnt the correct community to post this in, i couldnt find a generic 'what is it' community.
I'm guessing it copper oxidation maybe? Gold plating is usually done with a copper layer first then the gold is plated to that. Maybe clean your keyboard with rubbing alcohol after each use IDK.
I'd suggest to try removing (reduction of) the copper oxide with a rag moistened with a solution of citric acid in water.