So I've been using the same bottle of Photographer formulary 130 for about 8 months now, it still works beautifully... is this normal? It seems a bit excessivley long... I've probably run about 150 sheets of 8x10 total. It just keeps going! and it still has great contrast at 2 minutes, it still is great. the only thing is that it had some black particulate, but i filtered it out with a paper towel last night when i put the developer back in it's bottle... How much longer is this stuff gonna last? I've got a coffe can full of some old ansco stuff (amidol i think) that is supposed to make 10 gallons of working solution, which i am itching to mix up...