[jvm___]

I've wondered if you could stamp them into an aluminum can. Like with a typewriter (obviously too weak) or some vintage typesetting press device.

Not sure if the aluminum would last it probably would.

[GnarfGnarf]

I did this for a while. I found a roll of heavy-duty aluminum foil (not quite pie-plate thick), and scavenged some old dot-matrix printers. Removing the ribbon, I printed text and low-res images on the foil. I inserted a roll containing my father's biography in the ashes of his funeral urn. Should be readable by archaeologists centuries from now.

[yurishimo]

Depends on how thick the metal is. I’ve seen aluminum cans be eaten away by time. Something a few millimeters should suffice.