My experience is that Xtol 1:3 and FP4+ are an exceptional combination. APX100 doesn't do well in more dilute concetrations of Xtol although it performs well at 1:1. With APX I have returned to Rodinal with dilutions of 1:50 developed for 12 minutes at 68. Hope this helps. Check out the Darkroom Cookbook.(posted 8656 days ago)