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> C41 rinse water temp |
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#1
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C41 rinse water temp
I’m soon to process my first sheets in c41. Quite daunting! This will be in a jobo atl-1000 automated processor. Everything is being tested and seems to be good except the rinse water. I have two options, mains feed with thermostatic control or a tank/heater/pump combo to feed tempered water at the critical moment.
I’ve been looking at the equipment for either and have seen some instantaneous hot water heaters that can be set to 38°C. But they aren’t 100% instant. So initially water will come through the pipe for a second or two much colder. So my question, in order to avoid reticulation or other issues, would an almost instantaneous water heater be sufficient or must every single drop of water be at 38°C? Thanks |
#2
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I always rinse between the developer and bleach/fixer at 38c but the final wash can be anywhere between 30 and 40.. You appear to be using a different system to myself which is in a Jobo rotary system and the final rinse is for 6 x 30 seconds with water changes ay each interval. The stabilising bath I use the chemical again at 38c but do not agitate to avoid any bubbles and possible water marks when drying.
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#4
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Not at all. Just rinse for a few seconds more.
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#5
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Unfortunately this isn’t an option when using the JOBO ATL-1000 as all of the programs are pre set. Sent from my iPad using Tapatalk Pro |
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Film emulsion fractures easily with thermal shock.
So, in answer to your question - no I'm sure your first couple of seconds at wash water doesn't have to be at 38degC - but it will need to be 38 +/- 2~3C throughout the entire period - including the first couple of seconds. One hears of many photographers who process their own film complain about grain - most are likely to be suffering from reticulation (fracturing of the film emulsion due to thermal shock) Hope this helps Martin |
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#8
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Thanks John, I’m going to be super careful with my processing and maybe try a less careful approach when I have some film that I’m not too concerned about. If your suggestion works out then maybe an inline water heater would work well. Sent from my iPad using Tapatalk Pro |
#9
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Thanks Martin This response being the more conservative is the one I’m inclined to consider. So I’ll forget about the in-line electric water heater and stick with the heated water tank and pump. But also clear any water from the lines so that when it comes through to the film tank it’ll be at temp (minus the initially thermal losses from the lines). Sent from my iPad using Tapatalk Pro |
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c41, dev, rinse temp, water temp |
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