That's very interesting... maybe the stock solution in TEA just keeps better than in water? What would be the approximate shelf life of PC-Kodalk water developer concentrate? Do you add Kodalk right before usage of a diluted stock? I will be very glad if you would put here your recipe, so I can try it on FOMA films.
Maybe I did overheat the TEA. It worked fine, but it sure did, and still does, stink up the whole darkroom with a sweet-ish, unpleasant smell that persists for a couple of days. I bought it from the Formulary.
1 tsp. (5g.) Kodalk (metaborate) OR 1 tsp. (6g) carbonate (Arm & Hammer Washing Soda or PH Plus) See note below.
1/2 tsp. (4 g.) Vitamin C powder (ascorbic acid)
4 ml 1% Phenidone stock solution (1g dissolved in 100ml either Propylene glycol or 90% alcohol)
1 liter water at 70F (22C)
I use metaborate for Delta 400; carbonate for Delta 100, Fuji ACROS, and Neopan 400
6 minutes for Delta 400
6:30 for Delta 100
7 minutes for Neopan 400
7:15 for ACROS
You may need to adjust times, but these will get you close.
As you can see from above. I'm not talking about a two-solution formula. I make only one stock solution containing the Phenidone, either in Propylene Glycol or 90% alcohol. It's a 1% solution--1 g. Phenidone (1/2 teaspoon) to 100 ml of the liquid.Originally Posted by jdef
When I'm ready to develop, I fill a beaker with 1 liter of water at 70 F. (22C.), then stir in either Kodalk (s. metaborate) OR s. carbonate and the Vitamin C (ascorbic acid). Sticking a measuring spoon into a jar of chemical and stirring it into the water takes no longer on average than measuring two pre-mixed stock solutions. (These chemicals dissolve very rapidly.) Finally, I add 4 ml of the Phenidone stock using a cheap medicine dropper from the pharmacy. All this takes less than three minutes to mix, and I'm ready to pour it into the tank.
Result: lovely negs, very fine grain, very full shadow and highlight detail.
Some say that the Propylene glycol will preserve the Phenidone longer without loss of potency than the 90% alcohol, and theoretically that may be true. But a 100 ml bottle of the alcohol-Phen stock will make 25 liters of developer (in my two-reel tank (I shoot medium format mostly, and use a stainless steel Omega tank with 2 reels), that's 50 rolls of film. Since I'm only shooting for my own pleasure, and still holding down a day job, that's about 6 months worth of film on average for me. Maybe I also shoot a box of sheet film in that time too, and I use the same developer in 8X10 trays for my sheet film. I've never noticed any loss of potency with my alcohol-Phen. stock in a six-month period. So as far as my own working is concerned, it's longevity is a moot point.
If I wanted to not buy metaborate from a photo store or chemical company, I'd use Pat's formula mixing borax and lye into a stock solution, and then use 5 ml of that in place of the 1 tsp. of the metaborate powder. But at only a teaspoon per liter, a regular-sized jar of Kodalk lasts a long time.