The Paterson Developing Trays (Set of 3) are constructed of hard durable, chemical resistant plastic, and are available for all popular print sizes. These are 3x coloured trays (grey, red and white) that are 10" x 12" (25.4cm x 30.5cm) in dimension. The colour of the trays help differentiate between chemicals under safelight conditions. The base design of the trays give maximum economy of solution and easy print removal, with a convenient pouring lip for drip-free emptying. The trays are also stackable for easy storage.