HC110!! Cheap as heck, can be diluted to any dilution from syrup, syrup lasts forever and has worked great in my rotary tank and hand tank systems! It is my go-to developer (I've even used it for paper in an emergency with good results)...
+1, but haven't tried it with paper.
If I had been present at the creation, I would have given some useful hints for the better arrangement of the Universe.
Alfonso the Wise, 1221-1284