That just illustrates my point Vidar, if film is well vented, there should be no problem, keeping film entombed for years on end is bound to yield bad results. As for cross contamination, I still have reservations, if a new film is placed side by side with a vinegar print, I can't
see it doing any harm, if both films were locked in the same can for a while, it probably would. As I say, it is a film breaking down, much
like a very old car rusting away, parking a new car beside it would have no effect on the new one, but one is disintegrating. The so called "experts" that run storage facilities, are clueless themselves, film is kept in constant temperature, but still fastened up in cans fermenting away. The restored Hammer "Dracula", was a print found in Japan, in a facility, I covered this in depth a few years ago on the 8mm forum, granted they
restored the final uncut scenes, but half of that print couldn't be used, it was in such poor condition. Ventilation again, there are films far older than the '58 version of "Dracula" on 16mm that were used in hire libraries or TV outlets, but they don't suffer with vinegar syndrome, because they were used, out in the air, working prints, not sealed up. I take very little notice of "experts", particularly the Kodak ones, they have much to answer for, not only with film stock, but their so called cleaners.
As for IB Tech prints, they give in to vinegar too, no film base is without a weakness, but a bit of care and common sense goes a long way.