Film Tanks & Reels
When you are hand processing roll film in a darkroom it is usually done on reels in roll film tanks. You take the film out of its container in the dark and roll it around a spiral reel. After you have wound your film onto the reel you place it into a small tank for processing. Some tanks can hold various numbers of reels. Most center feed reels and tanks are made of stainless steel, but you can get plastic models as well. The problem with plastic tanks and reels is that they are breakable. The processing tank has to have a light tight lid that will let liquid come in and out, but not light. These are often called daylight tanks because once the film is safely inside it, you can process it in normal light. Tanks and reels need to be able to withstand the chemicals used in processing so they don't corrode. Tanks are also used for sheet film, but not the reels. Tanks and reels come in various sizes and range in price from about $10 to over $50.