Photographers' Formulary 03-0189 TS-4 Odor-Free Stop Bath - 1 liter For prints or film The unused solution keeps indefinitely. After the first use it should not be kept more than two months Prints: Capacity is about 20 8X10-inch prints per litre of working solution Capacity is about 29 rolls of either 120 film or 135-36 film, per liter of working solution