[georg16nik]

We are not thinking about the effects of humidity... We are talking about the natural properties of celluloid and the stability of the emulsion.
Show me film that has been in cold storage for 30 years and just been removed. That is the challenge now, not 30 years hence.

Slow materials, film or paper, keeps well even at room temp. 30 years in freeze or proper environment is nothing.
Kodak Tech pan, AgfaPan 25 and ORWO NP15 keeps very good in freeze, they are like new, fixed grade papers as well.