[metarinka]

of the top of my head most rads are resistance brazed. I don't believe they solder because of cost and/or bad joint strength. At any rate how heavy is it? grabbing a small piece of copper or Alu its very obvious one is much denser than the other, I'm guessing a radiator that size would be MUCH heavier. Looks like CU to me, ohh and if you dont' care about looks too much, I would get the powder coating sand blasted off.