Hello everibody.
What’s your experience with this developer?
There are some bottles in a shop and I’m wondering whether is worthy to buy them or not.
Best
Ángel Luis
It's a wonderful developer ~ incredibly flexible and versatile. It is a true acutance developer as well as compensating (up to +1stop) designed for medium and high speed film. I use it when Microphen (less acutance) and fine grain as another compensating developer, isn't as sharp. For medium - fast speed ISO film, it's right up there as one of the most legendary formula developers.
Longevity is a problem without decanting into smaller air excluding bottles. Maximum I've obtained is 6 months of working deep tank solution (mixed). Shelf life of bottles vary according to the bottle design:
White plastic bottle, 250ml - 500ml, squat portly can shaped [Black FX39 Paterson on White label with Grey) - 20 years old: virtually all exhausted even on opening the seal. If the shop holds a version like this, it is suitable for display purposes only and is most likely chemically inert by now.
Paterson FX39: Black plastic square columnar bottle, in 1 litre, with Paterson FX39 black on grey print - this was the reissue by Paterson (original) up until the company's demise over 10 years ago: sealed bottles still fully active.
Adox Paterson - this is the modern iteration - I think there have been about 2 versions of this, usually in more expensive smaller quarter or half litres after Adox acquired the rights to make FX39 following Paterson's disappearance. These are the most recent versions of FX39. I've not needed to use this - I'm still using the original no.2 Paterson above which is fully active.
Good luck!