Developing tank

This is necessary because most film is panchromatic and therefore can not be exposed to any light during processing.

[2] Depending upon the size and type, a developing tank can hold one to many roll or sheet films.

Famous brands include Paterson, Yankee, Jobo and Nikor.

In addition to protecting the film from light, the lid contains an opening for rapidly pouring liquids into and out of the developing tank.

Finally, a separate cap seals the canister, which prevents the contents of the tank from spilling when agitated by inverting the tank.