Shoot TRI-X at 1600 ASA,or PLUS-X at 320 with no increase in grain. This is not a push-processing developer, but a unique developer which increases the standard film speed rating of most films. An outstanding formula featuring very high acutance, ultra-fine grain, and great effective film speeds. Usable with all film types within a temperature range of 70° to 85°F. Available in powder form only. Great for low-light, available light shooting. Gives you an extra "punch" to your negatives.