Introduce a new Pyro-developer, which contains Menthol as Phenol. Metol 0.1g Ascorbic acid 0.3g Sodium Carbonate (monohydrate) 3g FRISK (trade name) 5tablets to dissolve in 600ml water at 20degree(C). This solution have no shelf life, so you should use immediately after dissolving. Example posted used Tri-X at EI(exposure index)=400. Agitate condition; continuously initial 30s, and 5s in every minute. Total developing time is 14minutes at 20C.