Can the Heat Metal spell target a set of Dragon Scale Mail made from metallic dragon scales?

The heat metal spell can target "a manufactured metal object", including "a suit of heavy or medium metal armor".

A suit of Dragon Scale Mail is clearly a manufactured object, but if it’s made from metallic dragon scales, is it metal, and thus a valid target? Are bronze dragon scales actually made of bronze, or are they just colored like that?

I’m just assuming chromatic dragon scales are inarguably organic.