It is for use with graded and variable contrast papers on both a resin coated or fiber base. The 16 oz. bottle makes five quarts of working strength solution and a developing time of 1 1 2 minutes is recommended for all papers. This can be adjusted up or down depending on the required results. This economical liquid concentrate should be diluted 1 part developer mixed with 9 parts water for working strength solution. Mix only as much developer as is needed for that particular printing session. Development times can range from 35 seconds to two minutes at 68°F (20°C). UNIVERSAL paper developer will produce a neutral image colour with all ILFORD papers. Unopened bottles of UNIVERSAL paper developer con-centrate will keep for about 18 months. A tightly capped half-full bottle will keep for at least three months. One liter of working strength developer will process about 45 8x10 inch fiber base prints and 70-80 resin coated prints.