old powder question

[Jack]

None of those cans are really old, so I doubt very much they'll have any collectors value.
Bad powder smells acidic, acrid, etc, with kind of an ammonia smell.
The sealed can of HP38 I'd keep and use- it's an excellent powder for light pistol loads like wadcutters.
However, the open cans of powder.....
I'd dump em- you have no way of knowing how they were handled, i.e, did someone accidentally dump 2 different powders into the same can? I wouldn't bet my life that powders didn't get mixed- and that's exactly what you are doing if you use opened cans you got from someone else.