If you want the old cans for a DISPLAY, get rid of the powder. Or load and shoot it up SOON if it's still ethery and "normal." I live in the Northwest so I have some good vintage stuff still, but I have dumped a few other cans and put the empties on another shelf. Self-preservation, I guess. But when in doubt, even now, it's smarter to spread it out -- on the lawn, or garden, your pick.
