Michael...I have developed hundreds of rolls of APX 100 and 400 along with many rolls of TriX all in Rodinal at 1+100 in plastic tanks that require 300mls (really 280) of solution. I use 3mls of Rodinal plus 300 mls of 68 degree water for 20 minutes. This information came from a Agfa handout...hope this helps...jim(posted 8745 days ago)