I used the same gallon of D-76 to process over 100 rolls, in a commercial situation. You have to add developer time for each roll. Memory says it was 13 1/2 seconds for each roll that had previously been souped in that gallon. It is a safe practice to continue for up to six months.
Because the film developer directly affects the image quality of the developed negatives, even the most economically-oriented film photographers are unlikely to reuse this product. That said, it is technically possible to reuse the film developer for multiple rolls, and it's something I've done in the past.
What's the shelf life of ILFOSOL 3 film developer? Unopened, ILFOSOL 3 will last about 18 months. Once open, it should be used within three months.
Simply prepare the stock, and reuse the developer until exhausted. Ilford recommends reusing it for up to 10 films. If you decide to use it one-shot, simply discard after use.
You can simply start with much longer process times or recombine each liter of used chemistry and extend the process by at least 5% for each roll previously processed. If a film does not appear fully cleared, process for longer in Df96. It will not affect development.
Yes you can keep using the stop bath until it changes color (it normally goes a purplish color), and then change it. With the fix you can keep on using it, however test before you use it.
To extend the life of fixer for a year or longer after opening the bottle, pour the solution into smaller sealed bottles or plastic pouches. A single liter of Ilford Rapid Fixer or Eco-Pro Neutral fixer can be reused to fix up to 120 rolls of film.
Full, unopened bottles of ILFORD RAPID FIXER concentrate stored in cool conditions, 5–20ºC (41–68ºF), will keep for two years. Once opened use completely within six months and keep all bottles tightly sealed until used.
Developer and stop, down the public sewer is safe and responsible. For fixer, do silver recovery. Simple way is to pour it in a soda bottle with a ball of steel wool. The silver will combine with the steel wool, you can decant and dispose of the liquid a week later.
In general: Mixed Developers can last up to six months if properly sealed. Mixed stop baths can usually last for years. As long as the color is a straw yellow, you are good to go.
If the stock solution bottle is not filled to the brim, its shelf life is about 2 months. If the stock solution is diluted to working strength (tank solution), its shelf life is reduced to about 24 hours.
The fresh developer solution is clear and light in color. However, the developer darkens with use and is no longer effective once brown or black in color. Developer concentrate in powder form has a shelf life of 2–5 years unmixed. After mixing it with water to form a solution, you can expect it to last from 2–6 months.
If you leave the film in the developer too long, the film is overdeveloped. The result of over development is increased contrast, along with increased density in the mid tone and highlight areas of the picture.
If they are unused chemicals, you can combine developer and fixer to neutralize them and then pour down your drain leading to a municipal water treatment center. (Do not dump it into a septic system.)
Stop baths can be reused repeatedly until they lose their acidity. Some incorporate indicators that change color when this happens: typically, they go from yellow to purple. Otherwise you can use litmus paper or simply replace the stop bath frequently enough that it is unlikely to exhaust.
Unopened bottles of ILFORD 2000 RT chemicals will store for up to 18 months. Once opened, the developer will keep for about 4 months and the fixer for 6 months in tightly capped bottles.
TF-4 is an extraordinary fixer for both paper and some films. TF-4 works well in batch processing, fixing resin coated paper in 30 seconds and fiber based paper in 60 seconds. You can also use TF-4 on T-Max films, fixing for 6 minutes to remove the magenta stain.
Ilford says 6 months once it's diluted. I think longer than that. The concentrate lasts a long time, more than year at least. I've only had concentrated rapid fix go bad on my once.
You can pour the fixer into a storage bottle as this can be reused. Now the film is fixed you can remove the tank lid. Wash the film in running water (20C/68F) for about 5-10 minutes. Alternatively fill the tank with water at the same temperature as the processing solution and invert it 5 times.
Method 1: use the fixer for one roll of film and dump it. Method 2: mix the fixer in a gallon jug. Use it once, and pour it into a one liter bottle. Use the stuff from the bottle and then dump it.
To keep automatic and manual processing solutions clean, change every three to four weeks under normal conditions. Normal use is defined as 30 intraoral films per day. Heavy workloads may require more frequent changes. Developer and fixer solutions should be replenished daily.
Place a drop of fixer on the film leader, or on a piece of scrap film cut up for the purpose. After 15-20 seconds, drop the film in the fixer and start the timer. When you can no longer see the spot – it is quite clear here – note the time: this is the clearing time.