Originally Posted by kjsphoto
As others have stated, the life of HC 110 is indefinite when kept as a concentrate and not mixed to a stock solution. You don't mention which film you are using. TriX will not expand much past N+1 with HC 110 even though that film/developer combination has been favored by many. Sometimes I find that I want more expansion then this combination offers. I have found other films that will expand more then that (Efke PL 100 and Tmax 400 as two). I don't use HC 110 currently. Preferring instead the Pyrocat formulation because of the proportional stain. The proportional stain gives better highlight tonal separation.
B&H Photo in New York has both Graded and VC Oriental Paper in stock. Prices are reasonable.
For stop bath, I mix 28 % acetic acid from glacial acetic acid. Then dilute from there. For film I mix stop bath at 1/4- 1/3 normal strength when I use Pyrocat or ABC Pyro developers for possible pinhole considerations. I use the normal dilution for paper.
I mix all of my own chemicals from individual componants. I find that this requires a scale capable of measuring in grams and tenths of grams. The cost of chemicals is not great. This method gives me a greater sense of personal creative output. One more area where I have been directly involved in the production of the finished print. This may not make much sense to anyone else but it makes a great deal of difference to me.