[TigersEye]

Spray paint any copper piping that you put in your houses because scrap yards will not accept it and copper thieves know this.

Could you expand on that a little? Why won't scrap yards take it? Is it because it's an identifier or because it degrades it for the recycling process? Or something else?

[Molon Labbie]

You hit it right on the head, it is an identifier and apparently it is a contaminant during the recycling process.