When I worked at the Crane (Indiana) Naval Weapons Support Center back in the 1980's, it was discovered that a great deal of WWII-era and perhaps earlier powder had become so unstable that they simply blew up the underground bunkers the powder was stored in rather than try to move it  Mini-earthquakes were felt all over the 100-mile square base for about two weeks.

Good story aside, your full cans of Balisite and Alcan are old enough that it''s a good idea to check them for signs of potentially dangerous deterioration: strong, acidic odor; rust-colored kernels or dust; rust around the cap or coming through the can from underneath the paper label; can suspiciously warm to the touch.  If ANY of these abnormalities are present, GET RID OF THE POWDER.   

Bill Lawrence

There's a market, just not a huge bounty for that era cans. The earlier the better with old powder tins.

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I wanted to add this can, not because it is of the same vintage as the others, but because I had never heard of them.  Titan out of California?

It's very hard to imagine nowadays, but California actually had at least two other major gunpowder manufacturers.  In fact, the first one, the California Powder Works, was the original producer of the famous Hercules brand.

Bill Lawrence