My clayton's is about out and I am in the market for a fixer. I used to just buy the stuff off the shelf but thought I would look for something to mix myself. Might be cheaper, might not we'll see. I did a search and could not really find the answer I was looking for What is the difference between alkalai and acid fix aside from the PH and one is alkalai and the other acid? I am looking for performance differences. I am looking for a dual purpose fix that can be used for paper and film. I looked at the recipe section but none of them said if you mixed a working solution or if it was a stock solution that you diluted.