"Don Sweet" <don@xxxxxxxxxxxxxxxx>
What an interesting suggestion about paper aging, that it starts from the date you open it rather than the date of manufacture.
It is just an observation. I do a lot of quasi-sensitometric testing of paper for the Darkroom Automation paper speed charts. When opened the papers from different emulsion lots can have the same speed within 0.1 stops*. However paper opened six months ago is always ~ 0.5 stops slower and ~1/4 grade softer than it was when opened. This is not, however, sufficient proof.Notes *: For Ilford, best case. Other brands have greater variation. Forte papers have varied by a 1/2 stop of speed within the same box.
== Nicholas O. Lindan Cleveland Engineering Design, LLC Cleveland, Ohio 44121 ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.