250swb
Member
About the 2 year expiration date, interestingly I have seen 3+ year expiration for 35mm Kentmere 100, whereas the dates are shorter with 120 and Delta (specifically 3200 for sensitivity reasons). I would wager that despite the tighter regulations (35mm) ISO 400 and lower B&W film still keeps quite well past the 2 year dates.
Since you mention 35mm it may be worth saying that the expiry dates seem to be much, much longer. I have some 35mm FP4 in the fridge that I bought last year and the expiry is mid-2027 so it reminds us this discussion is purely about 120 and if anybody has bought the same film at the same time from a stockist with a high turnover in both 120 and 35mm it would be interesting to know how the expiry dates compare.