This question may have been asked before, but you can’t search for “D76” as it doesn’t have enough letters.
Thank you very much!
Yes, it has, and I asked it in a parallel forum. I’d stumbled across the fact that another supplier listed a value of 16 films in their catalogue for the now standard gallon pack, and I had my doubts about that. It is true, however, insofar as the data sheet mentioned by Franz also quotes this value.
As is well known, D76 and ID11 are virtually identical (ID11 comes in separate sachets, D76 in one and apparently has a few more additives), so I’ve always used the values for ID11, and it states quite clearly: you need 100 ml per film, which theoretically makes 10 films per litre of stock solution. I’m too lazy to do the maths, so I just use 125 ml, add the same amount of water and work with a 1+1 ratio, just as Franz suggests, and above all, it fits into my Jobo 1510. Foolproof and it always works. The fact that you only get 30 instead of 38 films out of a gallon bag (3.8 litres) this way is easily worth it given the price of five to seven euros per film, depending on the source. That little bit extra in cents is definitely cheaper than the frustration of a ruined film.
On shelf life: I pour my batch into Aponorm bottles whilst it’s still lukewarm. This has the advantage that a bit of negative pressure builds up in the bottles as they cool. If I don’t hear a hissing sound when opening a new bottle for the first time, the contents go straight down the drain (at that price, it’s bearable – oh, we’ve been there before). I then protect an opened bottle with an inert gas (I use Protectan or lighter gas) and, if necessary, transfer it to a smaller bottle.
Martin
