Posted this question on the Large Format Forum but have feeling that a few photographers here also use this developer. After reading a bit about this developer I became interested in trying it out and after checking what I had of chemistry in stock I decided to give it a go. I mixed up 250ml of part A as I had enough Catechol for that. I first tried with Sodium Carbonate for part A but could have used Pot Carbonate as I had both. The problem I have are extremely thin negatives, I have developed Pan-F and TMY both in 120 format and I can't get anywhere near box speed as I read should be possible with reduced agitation. With TMY I get no more than Iso 100 Today I mixed up a new B solution from Pot. Carbonate but it did not change a thing. Is it possible that my Catechol was to old? it was stored for a few years, maybe 4 but still looked normal or I should say looked like it did when I purchased it. I used Pyrocat MC for a few years so I know what the negatives should look like but with OA there's just no similarity. Any idea what could be the problem? Thanks.