The nose of a blank looks nothing like the nose of a real round. Just spin the cylinder while looking at the holes!
As I said, the dummy rounds I’ve seen are bright colors, not brass. They are used for dry firing and for safety’s sake cannot be mistake for live or blank rounds.
With my Ruger, at least, one can point the barrel 60 degrees away from you and still easily see the tips of the bullets. Shouldn’t be a lead bullet in a blank, and for practicing Baldwin’s draw? There shouldn’t be ANYTHING in the cylinder!
If Baldwin didn’t know how to check, he should have ASKED. That is a reasonable precaution any reasonable man would make. And if you don’t take reasonable precautions, you should be liable.