I have found that the activity of the p-aminophenol-ascorbate developer is not greatly diminished by using 0.01 moles of p-aminophenol, 0.05 moles of ascorbic acid and 0.06 moles of sodium hydroxide plus 10 grams of borax. The borax and sodium hydroxide may be replaced by 16.7 grams of sodium metaborate. Thus the recipe becomes:
ascorbic acid................8.8 grams
2.4 grams sodium hydroxide + 10 grams borax
sodium metaborate........16.7 grams
Water to 1 liter.
FP4+ for 8 minutes at 70 F will still be sufficient for most purposes.