Ecopro Clear Stop Bath 32 Oz Ecopro Clear Stop Bath 32 Oz eco•pro Clear Stop Bath is an odorless stop bath based on citric acid. eco•pro Clear Stop Bath is dye-free, perfume-free and does not contain acetic acid. This stop bath quickly halts development and is compatible with all b&w fixers and a wide range of materials and processing techniques. eco•pro Clear Stop Bath can be used with a non-acid fixer such as eco•pro Neutral Fixer without any color change in the processing solution. eco•pro Clear Stop Bath is supplied as a highly concentrated liquid stock which can be mixed on a one-shot basis, or made into working solution and reused until exhausted, with or without replenishment. Dilute 1+31 for film and paper.