Best Film Developing Tanks: Universal, Multi-Reel and 35mm Picks

A film developing tank is a light tight container that lets you process exposed film in room light. You load the film onto a reel in total darkness, seal it inside the tank, and then pour developer, stop and fixer in and out through a light tight lid. The tanks in this guide, from the Paterson Universal to the eTone and YCCLDIPL tanks, all follow that same basic idea, differing mainly in how many reels they hold and which film sizes they list.

Many of them cover both. The Paterson Universal lists 4x 35mm or 2x 120 on its two reels, the YCCLDIPL universal compact lists 135, 120 and 220, and the eTone three-reel tank adds 127, 220 and 4x5 sheet film. If you only shoot 35mm, the TPPWR kit is listed specifically for 135 film. Always confirm the exact formats named on the product page before buying, since the listed range is what tells you whether a tank fits your film.

You need total darkness only for the loading step, when the film goes onto the reel. A changing bag is the common way to do that without a dedicated darkroom. Two picks here help with this directly: the Paterson bundle lists a darkroom bag, and the dedicated darkroom kit lists a film changing bag with the tank. The TPPWR 35mm kit takes a different route and states that no dark bag is needed. Once the film is sealed inside the tank, the rest of the process happens in normal room light.

Both work, and the choice comes down to preference. Plastic spiral reels often adjust between 35mm and 120 and load from the outside, which many beginners find forgiving. Stainless steel reels are usually one width and load from the core, and some developers prefer how quickly they dry. The tanks here are described with spiral reels rather than a stated metal, so if the material matters to you, check the reel details on the listing before you buy.

That depends on the reels. A single-reel kit, like the 120 and 135 bundle with a chemical bottle, handles one roll per run. Two-reel tanks such as the Paterson, YCCLDIPL and eTone two-reel let you develop a pair of rolls together, and the eTone three-reel tank scales up for busier sessions. Pick the capacity that matches how many rolls you usually finish before you want to process them.

A tank needs enough solution to fully cover the loaded reels, so larger and multi-reel tanks use more developer, stop and fixer per run than a single-reel tank. A compact one-roll kit keeps chemistry use low while you are learning, while a three-reel tank like the eTone needs a larger volume each time. The product listings here focus on formats and reels rather than exact fluid amounts, so follow the tank instructions and your chemistry dilution for the right volume.

The tank itself handles the film the same way whether the chemistry is black and white or color, and the darkroom kit here lists both color and B&W film. Several other picks describe black and white processing specifically. Color processes such as C41 are more temperature sensitive than black and white, so the main difference is in the chemistry and temperature control you use, not the tank. Check the listing and your chemistry instructions for color work.

Yes, especially the kits. The TPPWR 35mm kit states that no dark bag is needed, the dedicated darkroom kit bundles a changing bag, and the 120 and 135 kit adds a spiral reel and chemical bottle, so each gathers several first steps together. The Paterson Universal is also a friendly starting point because it includes a darkroom bag and takes both 35mm and 120. Whichever you choose, practise loading a scrap roll in the light first so the motion is familiar before you work in the dark.