I make picture frames from very old discarded wood. doing that require's I use wood putty quite a bit sometimes. Well I was making one today that needed a quick fix and emptied the tube. I cut the top and bottom off and split it in half. What I was left with sure looks like, bends like and feels like those old tin toothpaste we used to use. I think about how many of them I've thrown away over the years, make's me sick!
Thinking about this, I just picked up a tube of EnteDerm Ointment I use on a bald spot on one of my dog's. I folded it around a bit and I'm betting it's tin too. I've got a bunch of these laying around from past vet visit's.