ThomThomsk said:
OK, here's a question. I've got a Paterson developing tank and I want to start using it in the New Year. What is the best way to get everything to 20 degrees and to keep it there? I've been practising with water and it is hard to get everything bang on for any length of time - adding more warm or cold just gets me see-sawing around the right temperature.
Use a bucket or other large container. Fill it with water to 20C (or 24C if you use Microdol-X) + or - 1C. Keep stirring it as you check the temp. It's easier to get a large volume to the right temperature than a small volume.
Use this water to mix stop and fix and for the wash.
Mix your dev separately - if it is too cold to start with then you can find that mixing with water at 20C gives you only 16 or 17C.
Getting it right comes with practice but the trick is to mix with small quantities of hot until yo get it to 20C
then add water from your bucket.
Another trick is to keep the room you process in heated to 20C. This means that all solutions stored there will be at or around ambient, making it far easier to get them to the right temp.
It will also minimise heat loss from the dev tank.
If you can't get the room very warm then do the above - but make a heat jacket for the tank from thin expanded polystyrene or bubble-wrap. The principle is the same as lagging your hot water tank. And store your chemicals in a warmer room.
If you have a lot of money to throw around you can buy thermostatically controlled water baths - but the above will work just as well.
Dev needs to be spot on but stop, fix and wash is OK if it's within 5C
Does that help?