When it is first mixed, D-76 is more active than normal. If you use it immediately, your negatives will be developed more than normal.
After 24 hours, the activity will have stabilized, and thereafter will remain quite consistent for some time, until the developer starts to degrade due to age.
I don't have quantitative information about how much over-development will occur because of using freshly mixed developer.
When it is first mixed, D-76 is more active than normal. If you use it immediately, your negatives will be developed more than normal.
After 24 hours, the activity will have stabilized, and thereafter will remain quite consistent for some time, until the developer starts to degrade due to age.
I don't have quantitative information about how much over-development will occur because of using freshly mixed developer.
Will it stil mix OK with tap temp water? Or does the water have to be heated?
Will it stil mix OK with tap temp water? Or does the water have to be heated?
Can you mix a stronger solution and then cool it off quickly with cooler water to reach the proper concentration?
Since you used the word "legitimate", I'd say Kodak and Ilford are probably the most legitimate sources for D-76/ID-11. Follow their mixing/processing directions. I don't think either company indicates any kind of "stabilization" period is needed after mixing.
You could, however it's not really an advantage.
When I used deep tanks and ID-11/D76 we always noticed the first few films in a new batch lacked the quality of the later films, first fresh D76 hasn't had time to equilibilise which takes a few hours, and second later films benefit from the slight build up in bromide and other pocessing by-products once a few films have been processed. The Highest quality from full strength ID-11/D76 is when used replenished, followed by using at 1+2.
Remember these developers were designed for replenishment from the outset.
Ian
Michael:
IIRC, the package directions themselves on D-76 recommend waiting 24 hours after mixing.
It depends on your water supply, not all dissolved minerals are detrimental. Kodak designed their chemicals and development times for "normal" tap water whatever that is. They do not specifically recommend distilled water because it might actually change the developer's performance slightly. I would be more concerned with the water used with the Photo-Flo, which at least ought to be filtered - distilled might be even better..... Tap water has many minerals in it, whereas distilled has none.
It depends on your water supply, not all dissolved minerals are detrimental. Kodak designed their chemicals and development times for "normal" tap water whatever that is. They do not specifically recommend distilled water because it might actually change the developer's performance slightly. I would be more concerned with the water used with the Photo-Flo, which at least ought to be filtered - distilled might be even better.
I'm looking at a package of D-76. It has no such recommendation. The directions say (using graphics as well as words):...IIRC, the package directions themselves on D-76 recommend waiting 24 hours after mixing.
I'm looking at a package of D-76. It has no such recommendation. The directions say (using graphics as well as words):
"To Make 800ml (tap) water at 50-55C / 122 - 131F → Stir (contents of packet) Until Dissolved → add (tap) water to make 1 Liter"
selmslie;1519441................ They do not specifically recommend distilled water because it might actually change the developer's performance slightly........................... [/QUOTE said:Where did you get that info? I never read anything that said that from Kodak, did I miss it?
Since you used the word "legitimate", I'd say Kodak and Ilford are probably the most legitimate sources for D-76/ID-11. Follow their mixing/processing directions. I don't think either company indicates any kind of "stabilization" period is needed after mixing.
EDIT: I'm sure though that somewhere there are or were instructions that specifically referred to allowing the developer to cool to room temperature.
I remember some of the old timers around here pouring an ounce or two of old (oxidized) D-76 into a gallon of freshly mixed to "season" the new developer and get away from the 24 hour wait..........Regards!Hi, ive seen a thread or two on this subject, some people have explained they havent had any trouble with using their freshly mixed stock d-76 as soln as it cools, others say you have to wait 24 hours after mixing to use. Can i get a legitimate explanation why this 24 hour rule would help the developer in whatever aspect rather than using as soon as it cools? Thanks.
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