Quick Question (D76 1:1)

[Bill Burk]

... drop it into a water bath to bring it to temperature. Will it keep for however long that takes? How long will it keep for that matter?

Yes, it will keep for long enough to get to temperature. All the advice here is good. It will be good for several hours. Literally, after several hours you might have to develop 15% longer. But it's not a race to disintegration like when you mix Part A and Part B of Farmer's Reducer together.

[JaZ99]

Keep in mind that the tank and film has its own temperature, which is tipically higher than temperature of the developer. In my case (plastic Jobo 1520 tank) temperature goes up by 1°C when pouring 19°C solution into it. Just my $0.02.

[Gerald C Koch]

An ice cube in a plastic sandwich bag works very well for reducing the temperature of the diluted developer.

[Worker 11811]

Keep in mind that the tank and film has its own temperature, which is tipically higher than temperature of the developer. In my case (plastic Jobo 1520 tank) temperature goes up by 1°C when pouring 19°C solution into it. Just my $0.02.

Yes, whenever I temper any solution I always account for the "thermial inertia" of the container.
Depending on the material the container is made out of plus its size & mass, you'll probably have to stop a degree or two before you get to temperature so the solution can "coast."

My heavy, glass beakers and Pyrex measuring cups need about 2º of coasting room. My plastic (Patterson) developing tanks usually need only 1º. Metal tanks and plastic margarine tubs, etc., only need 0.5º to 1º.

I usually keep my containers standing, partially submerged in my tempered, 20º container of running water so, hopefully, they'll coast and stop at just the right temperature.

[tkamiya]

I've read that if I'm going to dilute D76, to dilute it just before developing -- i.e. don't keep or store diluted developer. I use it 1:1. What about bringing it to temperature? Should I bring the stock solution and water to temperature separately then mix the working solution, or can I mix the working solution then bring it to temperature? Or does it matter?

And just as a matter of curiousity, roughly how long does diluted developer keep? Thanks.

This process isn't all that critical. I have done this both ways. Mix the solution to 1:1 and adjust the temperature OR take D-76 and add cold water to make it to the right temperature. My recent method is the latter. Using chilled drinking water in frig and the tap water, I can pretty accurately bring the solution to the right temperature. In my own process, I have taken up to an hour for this process and encountered no issues.

I've never tested how long this diluted solution lasts. I have never seen any degradation or change in the amount of time it takes to stabilize the temperature. With exposure to oxygen (it's no longer in a capped bottle), I would *guess* 12 hours or longer might be pushing it.

You can always call or email Kodak's professional service and ask questions. I've always received an answer in a day or so.

[Terry Christian]

I keep a PUR brand filtering container of water with a tap (meant for keeping drinking water cold in the refrigerator) on a shelf in the bathroom at all times, so that I can have room temperature, filtered water always ready. The water is effectively de-oxygenated because of its sitting still for so long.