Flic Film Allergen-Free Fixer is formulated to eliminate the ammoniaand sulfur dioxide fumes that can cause allergic reactions, which is nice, because who needs that? Non-hardening, hypo-style formulation. Dry crystalsmix to produce 1l of stock solution.Note: The crystals in this product are coarser than typical powder formulas.This is not a defect: the crystals dissolve readily and won’t give you any grief.