FORMULARY FIXER 24 is a non-hardening sodium thiosulfate fixer. Without hardener, prints are easier to wash, tone and spot. Prints are fixed in two successive fixing baths requiring 3 to 5 minutes in each bath. The chemicals in this kit are used to make a working solution, which has a shelf life of 2 to 4 months. One liter fixes about 25 8 x 10 prints.