Paterson Developing Trays — Set of 3 .

Three trays for print processing — one for developer, one for stop bath, one for fix. The colours keep you organised in the dark.

Each set comes in grey, red, and white so you can tell them apart under a safelight. You shouldn't cross-contaminate chemistry between trays, and colour coding makes that automatic.

The ribbed base lifts the print slightly off the bottom, which helps chemistry move freely underneath it. The thermometer ledge along one edge lets you rest a thermometer in the tray to monitor temperature. Each tray has a pouring lip so you can empty them without drips. They stack when you're not using them.

Choose the size that matches the paper you're printing on — 5×7 to start, 8×10 for the most common print size, 10×12 when you want to go bigger.