tuanvo1982 Posted February 28, 2012 Share #1 Posted February 28, 2012 Advertisement (gone after registration) Hi all, I am using ILFord rapid fixer 50mml for developing my FP4 roll. Last weekend, I had only 20ml left but actually I should have 60ml. I mixed 20ml with 280ml water. After that, I tried to find the time of fixer process by putting the leader of the film roll into mixed fixer liquid and check time until the film is clear. Finally I got result is 5 mins. In paper work, they stated 60ml + 240ml and we need 5 mins however, with 20ml in 5mins I see the film is clear as well. So what is the purpose of wasting 40ml of fixer? Btw, If we re-used developing chemical, do we have any way to check how long the developing process(I mean the 1st step) should take ? Thanks Link to post Share on other sites More sharing options...
Advertisement Posted February 28, 2012 Posted February 28, 2012 Hi tuanvo1982, Take a look here Fixer process's question. I'm sure you'll find what you were looking for!
stunsworth Posted February 28, 2012 Share #2 Posted February 28, 2012 Btw, If we re-used developing chemical, do we have any way to check how long the developing process(I mean the 1st step) should take I never re-used developer. Xtol was dirt cheap, no need. Isn't fixing meant to be 2 x time to clear? Link to post Share on other sites More sharing options...
tuanvo1982 Posted February 28, 2012 Author Share #3 Posted February 28, 2012 I never re-used developer. Xtol was dirt cheap, no need. Isn't fixing meant to be 2 x time to clear? oh yeah!!! you are right. I forgot developer is cheap 20ml and 60ml all get only 5mins to clear the film Link to post Share on other sites More sharing options...
Maarten Posted February 29, 2012 Share #4 Posted February 29, 2012 You will be surprised, but when you dilute your fixer even more and wait 24 hours your film will still get clear. However Ilford gave you you a certain mixing ratio in order to guarantee the process. Five minutes to clear your film in a fresh fixer solution is too long: as soon as your solution will be used when you fix a full film, the time to clear will increase and your process will become unreliable. The same is true for the developer. A small volume of developer will be more prone to air-oxidation than a large tank. Therefore replenishment solutions are in place for large tanks while most people using small tanks rely on one-shot developers. Peny-wise and pound foolish is that what the English like to say? Take care, Maarten Link to post Share on other sites More sharing options...
maxspbr Posted March 7, 2012 Share #5 Posted March 7, 2012 Old formulary suggest adding 10% for each roll over the previous roll. Total capacity is around 10 rolls per liter, but this can vary. If you add fresh developer to full the glass, of course you will have more power - and more active "live" for the bath. Hi all, Btw, If we re-used developing chemical, do we have any way to check how long the developing process(I mean the 1st step) should take ? Thanks Link to post Share on other sites More sharing options...
fotohuis Posted March 7, 2012 Share #6 Posted March 7, 2012 A one shot developer is the best way to stay away from all kind of crappy problems during the developing process. The fix process is going into depletion. If you make fixer for film: 1+4. You test the clear time and the right fixer time is 2x the clear time. Slowly your fixer gets saturated with Ag+ (SIlver) ions. For film the limit is 2-3g ltr. Ag+. You can test this with a 10% KI (Potassium Iodide) solution. 10ml fixer under test + 5 drops KI: Milkey and clears up: under 2 g/ltr. Stays milkey: over the limit. In fact a chemical titration. You can also count down the amount of film which has been done with the fixer solution. But also take notice that modern technology films (Tmax, Delta Acros) are blocking the fix process earlier: About 60% capacity left with these films. Best regards, Robert Link to post Share on other sites More sharing options...
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