At one time I had the cooling unit for an old water fountain setup as a water chiller in my dark room. Worked well with a temp control valve. Chillers were the standard in pro darkrooms in days gone by, but now they usually us high temps and chillers have kind of disappeared from the darkroom catalogs.
Even farther back we used to use the old aluminum 35mm canisters. Fill them with water, freeze, and drop two or three into the developer until the temp was down to 68F. Another way is to use delute developers at a higher temp, that gives about the same development time as the more concentrated developer so you get fairly even development. For instance a 20 min developing time at 68 degrees drops to about 14 minutes at 75. graywolf http://www.graywolfphoto.com "Idiot Proof" <==> "Expert Proof" ----------------------------------- Don Sanderson wrote:
I've just purchased the components to design and build some precision temperature controls for darkroom chemistry. I have the heating part down but am at a bit of a loss as to what to use for cooling the different solutions. Other than keeping the entire darkroom at 68 degrees or below does anyone have any ideas as to how to keep developer, etc. at the correct temp? Unfortunately the tap water here runs 70-74 degrees at its coldest in summer. I'd actually like to be able to run at 65 degrees to keep developement times long and controllable. My only thought is a large container of water in the fridge that could be circulated around the bottles and tank. Any ideas welcome. Don
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