I have a couple reels of my father's 16mm film that has that smell.
And the smell was STRONG STRONG STRONG !!! It was like stop bath concentrate.
I made the mistake of opening the 16mm can in the house PHEW !!!
I had the film converted to DVD, but I would still like to keep it.
PE, do you know if Kodak still sells the packet of acid absorber? I recall reading about where you would put the packet around the film to absorb some of the acid and slow down the deterioration.