Edwal Ultra Black is a convenient liquid black and white paper developer concentrate produces densest blacks possible.
This developer is for use on both RC and fiber-base papers.
Ultra Black is highly concentrated, just one quart develops up to 250 - 8x10 prints. It has a working temperature range of between 55-90°F.
This developer is very versatile in that by varying the dilutions you can achieve tones ranging from high density cold images to warm portrait blacks.
One liquid pint makes 2.5 gallons working liquid, a quart makes 5 gallons Liquid and a gallon of concentrate makes up to 20 gallons.