Hello, Yesterday, I posted this: http://www.apug.org/forums/forum48/64725-fp4-long-exposure-extreme-pull.html. I put it in the exposure forum. I got some info on reciprocity that helped me out, but I wanted to really get into the idea for modified D-23. Basically, I have a handful of questions: 1. How would halving or quartering the amount of sulfite in D-23 affect its characteristics? 2. How would making the developer with no sulfite at all affect the characteristics? Basically, I am asking if sulfite has any effects other than as a preservative and silver solvent. For instance, does it affect pH, and thus developer activity? 3. I am thinking of using a reduced agitation method of development to alter contrast and see what bromide/edge effects I can get. What is the minimum amount of metol powder needed to develop one 20 in² piece of film? 4. What is the life of the developer mixed with no sulfite? Will it go off in 10 minutes? 30 minutes? A day? All I need to do is mix it, let it cool, and then I will use it straight away. 5. I have no gram scale at home, but I do have kitchen measuring spoons. I have searched a bit and found that 3g is average for a level teaspoon of metol. Is this correct? I am thinking of mixing a working solution directly by putting 1/2 tsp of metol into 1 liter of water. Going by the D-23 formula, which calls for 7.5 g of metol to make a liter of stock, this would be the same as a 1:4 dilution of stock to water. Grain is OK. Low contrast is OK. I am interested in getting some tips regarding minimum amounts of metol required, the effects of sulfite on pH, and keeping properties of the developer with no sulfite or reduced sulfite. Thoughts? Thank you in advance.