I bought some liquid to develop T-Max 4x5. In the undiluted form, what is it's shelf life? What about after diluting?
I bought some liquid to develop T-Max 4x5. In the undiluted form, what is it's shelf life? What about after diluting?
Toss it after use. It oxidizes.
There are several formulas available. Did you purchase the version which is mixed in Water, or in Glycol ?
I mean before use. I always throw out developer after use.
I'm asking because, for instance, using HC-110, I leave it in concetrated form, and mix only enough developer to develop my current batch of negatives. HC-110 has a much longer shelf life in concentrated form. I want to know if I can do that with Pyrocat HD, or if I should mix the whole thing into working solution. If so, I'm guessing that the shelf life is much less. If it is, it would be wasteful for the amount of film I develop.
I can't tell from the package whether it is water or Glycol, and their website doesn't say either. The catalog number is 01-5081. Could be one of those things where if it doesn't say "Glycol" explicitly, that means water.
The Glycol based Pyrocat should last a good long time...think years. The Water based Pyrocat will last around a year.
Leave it in concentrated form. Use it like you use your HC-110 syrup...mix up the working solution immediately prior to developing the film.
Whose catalog # did you list? My understanding is that the Formulary now sells it in Glycol. I can't imagine there would be any demand for Water based Pyrocat if Glycol was available.
Bought it from digitaltruth.com
Ask digitaltruth if they mix it with Glycol. Formulary used to mix it with water, but they switched to Glycol almost a year ago.
It is obviously a product that Digitaltruth buys from Photoformulary, as the catalog number is the same and Digitaltruth promotes the fact that it is a Photoformulary product.
Now, the only remaining question is whether your kit has been on the shelfs for a long time or if it's fresh. (Or: Did Photoformulary change the catalog number when they switched to Glycol?)
//Björn
Photoformulary lists 4 products
Pyrocat HD Liquid 10 Liters - 01-5081
Pyrocat HD Liquid 50 Liters - 01-5083
Pyrocat-HD in Glycol 10 Liters - 01-5091
Pyrocat-HD in Glycol 50 Liters - 01-5083
so I guess they just sent what I ordered. I didn't know there was any difference, but I'll know for next time.
If you buy a Pyrocat kit directly from Photographers Formulary you can be almost certain that it has not been on the shelf a long time. PF has people mixing chemicals on a regular basis and I doubt very much they keep any of the kits on the shelf for more than about a month after mixing.
Sandy King
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