Ilford Ilfostop is a low-odor liquid-concentrate acid stop bath for black-and-white film and paper processing. Used after development, it neutralizes developer before the fixing stage, helping keep developer carryover out of the fixer.

Clear end to the development stage

The 500 mL concentrate makes 10 L of working solution. A pH-sensitive indicator dye changes from yellow to purple as the solution becomes exhausted, giving darkroom workers a visible cue during processing.

For film and print workflows

Ilfostop is suited to tank, tray, dish, and deep-tank processing. A full-strength working solution is rated for up to 150 rolls of 135-36 or 120 film, 600 810 in RC prints, or 300 810 in FB prints.