My question involves a term that occurs in a game called Refined Metal. It's used to describe an item, such as when exchanging game coins. I am semi-arguing with my wife about whether I need to use the term Refined Metal or Refined Metals.
Here is an instance of the type of conversation we have been having:
Me: I am willing to exchange tickets for Refined Metal.
My wife: How many?
Me: 12 of them.
But my wife tells me I should say:
I am willing to exchange tickets for Refined Metals.
Or another example:
Buy Refined Metal for tickets.
So what is the correct usage?
As I know that it's all the same type of metal, I don't believe I need to use the word 'metals', because this would imply that I'm referring to different types of metal. My situation involves different amounts of the same metal.