This is related to an enquiry to see if there is sufficient demand to justify stocking FP4 and HP5 in 70mm, see another thread in 'product availability'. At Silverprint, we have been involved in various film 'special order' ventures before. Where they have very often come to grief is that the sales have been too slow to move the stock within the expiry date specified by the manufacturer. Residual stock had to be sold at a loss, and there was consequently no incentive to repeat the order. Cold storage, especially deep freezing will extend the potential useful working life of a material considerably. Can this be worked into a way of extrapolating an extended 'expiry date' ? One scenario is that the film material, upon receipt at the dealer, is immediately placed into deep freeze. We at Silverprint have quite a number of active APUG people as regular callers - one or two of these could be appointed as 'external auditors' who could be responsible for checking occasionally that the storage was in order (ie freezers switched on) and perhaps be present when we checked out an average 6 months supply to put into the normal cold room. On this basis, could we override the normal expiry date? This then poses the question of what is the potential, and practical, 'expiry date' of freezer stored film, and also which is acceptable to the people on this forum. At a time when every trick in the book is needed to keep film products on line, this must be an area to be examined. And conceivably could manufacturers give an alternative expiry date based on most favourable storage as well as one calculated on lowest denominator?