The late Barry Thornton recommended 24C for Perceptol. His own observations concluded that the shortening of the development time was welcome and there were no obvious practical downsides. I use the same myself. In the UK, where AC in homes is uncommon, using 24 C allows me to heat my room and water on all but a few days of the year. Chris Woodhouse ARPS On 20/3/05 4:28 pm, "David Swinnard" <davidswinnard@xxxxxxx> wrote: > I grew up using 20C (68F) as a standard temp. for film developing, and > in my non-southern (NA centric view) location seldom had issues > maintaining it, summer or winter. The cold water tap always delivers > sub-20C water here. For unknown reasons, I started to wonder whether > there are any significant benefits to using other (higher) temperatures. > The only obvious one I can think of is shorter dev. times though I've > not yet been rushed enough to pursue a higher temp. for that reason > alone. (My previous reluctance to move chemical temps. beyond room (20C) > temperature is dealt with by the JOBO CPA-2 now available to me. > Sometimes it just makes a fine chemical-tempering unit rather than a > developing system.) > > So, are there any compelling reasons to re-think my dev. temp. > strategies? I seem to recall reading somewhere that > Perceptol/Microdol-type formulations benefit from temps in the 24C (75F) > range but can't remember the reasoning. What about other developers? > Will I gain anything, beyond shorter dev. times? Are there implications > for sharpness, grain, etc. with higher dev. temps? (keeping them in the > realm of the reasonable) > > I frequently don't bother with the JOBO for a few rolls of film and use > my old SS Nikor tank and reels. sheet film is always in the JOBO now. > > (In my darkroom, over the last few years, you would likely find devs. > like my regularly used XTOL (1+3, never a problem had), FX-39 (when I > can get it), Rollo-Pyro (from B+S), Perceptol (at 1+3) and even Pyrocat > HD once. Films typically TMY or HP5 in sheet and Acros, TMX, Delta 100 > in 35mm/roll formats.) > > Just curious, Dave > > ============================================================================== > =============================== > 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. > -- Regards Chris Woodhouse ============================================================================================================= 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.