A true fine grain developer according to Mr. Crawley. However as with most fine grain type developers a speed loss is in the trade. Here Mr. Crawley recommends an exposure increase of to 1 stop over the your normal exposure. Recommended developing times are,

Kodak's Plus-X 10.0min.@68F

Kodak's TMX-100 8.5min.@68F

Add the sodium sulfate slowly to avoid caking. Dilute this developer 1:1.