There have been conflicting reports on the use of PMK in a drum. Initially it was reported as being not recommended. The most recent information that I have is that it can be used...so who knows? It does carry the consideration of stain color as it affects variable contrast paper.
Originally Posted by bmac
Insofar as a liquid version of Pyrocat, I don't know of anyone packaging it in that way. It would be a simple matter to take the dry chems and mix them upon arrival...that way you wouldn't have the dry chems around the house. The individual stock solutions have a sustained shelf life so that shouldn't be a problem.
I have used ABC in the past, although not in a drum. I have found that ABC has objectionable grain when one enlarges the negative. It enables excellent film resolution and works very well for contact printing. However it does have a rep of not providing even development.
Having tried all three of the mentioned developers the one that I have found to enable use as both a contact printing developer and an enlarging developer is Pyrocat. It can be used in a drum. The grain sure is a lot better then ABC when enlarging. It does not affect variable contrast materials in the same way that PMK can.