@IrelandTorin True, but I think the joke here was how easy it is for folks to make accidentally.

@Siren_six Oh, I was making a joke myself - while yes, it is easier to buy it by the cylinder if you have the right supplier connections, if I were buying that much chlorine (ie a size K cylinder like the ones I use for the decidedly-more-mundane nitrogen) I'd imagine one should probably question what I was using it for, LOL.