I had forgotten that Nico Brinck said that Dutch guns were bronze, not brass

I believe that Frank Fox always says that 17th Century guns were brass, but Nico Brinck, sea captain, who is into marine archaeology and Dutch guns, says that they were bronze. I had forgotten that is what he had told me. I looked up the old mail from late December 2004, and read that again. I had a question about what a "copere" gun meant, as opposed to "metaele", which is bronze.