Mill scale, that’s what it’s called. Frankly, I have no idea whether I’m using hot or cold rolled. I usually go to the steel store and raid their scrap department. This store does fabrication so some of 6heir scrap is beautiful stuff but no mention of hot or cold. I’ll be going there, hopefully next week, and I’ll be asking if they can advise me. I’ll be trying that HF nylon cup—when I get balls enough to go into one of their crowded stores. Thanks for the suggestion. I needed that.
