Lewis Downey: Darkroom

My darkroom is starting to shape up. This week, I acquired an excellent set of cabinets and a great old dry mount press.

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"robert/pat poor" wrote:
I am looking for some leads to information on using Tmax RS in dilutions 
weaker than the standard 1:4 to lengthen the development times which become 
too short of warmer temperatures. Oh...the applicable film is Tmax 400 and 
Arista 400 sheet film (presumed to be Ilford HP5)....these are at 6 1/2 min
but some others get really short in time.

My DR is still packed in boxes (along with my memory) following our recent move, so I can't give you what times I have for TMY. But my normal time for TMX EI-64 is 11 minutes @ 75Ã[infinity]Æ[base ']Ã[integral]âo[dot accent]Ã[infinity]Â¢Ã¢âo[ring]Â¬Ã[sigma]Â¡Ã[infinity]Æ[base ']Ã¢â[not equal]¬Å¡Ã[infinity]âo[ring]Ã[not equal]Âª in a 1:9 solution. TMY EI 250 or 320 would be slightly shorter, maybe 10.5 or less. Can't help you with Arista, but the change ratio may be similar. Mix it straight from the syrup and not from stock. When you crack open a fresh bottle to begin using it, just dump the additive in from the envelope. For compensating development I mix it 1:15, starting with the same amount of syrup. Times for that are in the boxes.

Maybe I am fooling myself but I find it to be a very stable developer during
storage....and not very special storage at that...just the plastic mineral
water bottle.

Stock solution = 2mths. Syrup in the jug = a very long time. Peace! Sidney -- http://www.divinelightphotography.com

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[Macro error: Can't evaluate the expression because the name "31197440" hasn't been defined.] I am looking for some leads to information on using Tmax RS in dilutions weaker than the standard 1:4 to lengthen the development times which become too short of warmer temperatures. Oh...the applicable film is Tmax 400 and Arista 400 sheet film (presumed to be Ilford HP5)....these are at 6 1/2 min but some others get really short in time. One of the pubs I have seen had a article on this but darned if I can remember. Maybe I am fooling myself but I find it to be a very stable developer during storage....and not very special storage at that...just the plastic mineral water bottle.

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This weblog is opening up to our Zone System mailing list. Articles sent to the mailing list will be selectively published here. This is a very cool thing.

[Macro error: Can't evaluate the expression because the name "31197440" hasn't been defined.] I have a half used plastic bag of Sprint Speed Fixer and it has developed a white precipitate in it. It is generally stored at about 55 deg F and has most of the air removed as I use it. Is the precipitate fixer coming out of solution or a decomposition by product? and if the latter...what is the chemistry of the decomposition or reaction leading to the precipitate. Hypo should oxidize to a sulfate and thus be quite soluble. Anyway Mees?s book did not tell me much about the hypo itself. Bob

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