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#31
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no I don't drink it I wash my film in it
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#32
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As I mentioned earlier I have it lodged in my head that cold water is not as efficient as tepid or warm water for washing negatives.
I remember going overboard at one time when everything I printed had to be of archival quality. So maybe it came from there. However, Ilford do not mention water temperatures on their technical sheet concerning water saving when washing films and prints. |
#33
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temperature wise I just use what ever the temperature of the water is ,I have negs and prints I took in 1972 and they are still OK
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#34
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I think Ilford state 5C degrees, as the minimum, which is not that warm, so water from our taps should be okay for at least the majority of the year.
Terry S |
#35
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Quote:
It’s in my mind that the recommendation is ‘within 5 degrees of the processing temperature’ ie 15-25C if you process at 20C. I’ll have to check. Alex Sent from my iPhone using Tapatalk Pro |
#36
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There may be an argument for keeping film liquids i.e. dev, stop, and fix within a few degrees of each other for the sake of the emulsion but if you are developing film the developer has to be about 20 degrees C and it is likely that unless the darkroom temperature is way below 20 and getting uncomfortably low then stop and fix will be within a few degrees of that
The danger with some makers' emulsion is that if the wash water is straight out of a cold tap in winter so may be 15 degrees colder, then that emulsion might be subject to a temperature "shock" I cannot recall what Ilford states about film liquids range if it says anything but clearly for paper it would not appear to see a problem with its paper emulsion being in 20C then plunged into as little as 5 degrees C For what is worth I keep my film wash water, using the Ilford method and a 3L container of water at about 1 degree of the rest of the chemicals but have not seen a problem when the water for paper washing is about 10 degrees C lower. Mike |
#37
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From the Ilford information on their site the following is quoted for Washing on their latest Film Processing Chart.:
"Where a non-hardening fixer such as RAPID FIXER or HYPAM has been used, wash the film in running water for 5-10 minutes at a temperature within 5°C/9°F of the processing temperature. To aid rapid, even drying, after washing fill the tank with water and add ILFORD ILFOTOL Wetting Agent (1+200) and give the tank a final 5 inversions." So it is 5 degrees C lower than the processing temperature. That would indicate 15 degrees minimum wash water temperature if you process at 20 degrees. |
#38
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Quote:
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I was thinking of RC paper washing, when I mentioned 5C degrees, with as you say, wash water for film should be approximately 5C degrees either way of the chemical temperature. Terry S |
#39
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There was quite a bit of interest in this method of film washing a while ago. Well worth having a read. Cheers.
__________________
It will all be over by Christmas. |
#40
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SORRY
The last post of mine here should have been in a different thread. My computery skills need improving.
__________________
It will all be over by Christmas. |
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