Thanks to all of you who have responded generously to this thread. Now, trying to twist it back to the original question: Suppose a standard published hydroquinone/metol film or paper developer is built from its chemical constituents (not from powder in a sealed package) and brought to 68 or 70 degrees F. in a cold water bath within 30 to 60 minutes. Suppose a second identical mixture is allowed to sit in a pyrex flask overnight, covered with a watchglass, comes to the same (ambient) temp on its own, and is considered to be 'ripened' after 12-18 hours. Questions: Will these two solutions have different chemical properties? Will film or paper respond differently to these two solutions in any significant perceptible way? Thanks, Harry. ============================================================================================================= 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.