Step 4The developing tank
The tank is what the film is put into when your are developing the photo's, it has a light proof pouring spout at the top where you can put the developing chemicals in without letting any light get onto the film and ruining it.
The tank consists of a number of parts (from left to right in the photo):
The Tanky Part- this is where all the chemicals are contained and stopped from flooding all over your floor
Light proof seal - This fits in a recesses in the top of the the tank and helps stop light getting in and chemicals coming out.
Central Spool - this is what the film spool and retaining clip slide onto, it sits in the centre of of the tank.
Film Spool - The film is wound out of the film canister and around this spool, it has ridges in the two end pieces so each wind of the film is kept separated and chemicals can get to the film, it can also be split apart in the centre for easy extraction of the film once it is developed.
Retaining Clip- This is a small plastic C shaped clip (can be seen resting on the edge of the film spool), once the film spool is slid onto the central spool it slides on after and holds the film spool in place making sure the film sits at the bottom of the tank amongst the chemicals.
Misc. Twisting Thingy - this is the small black plastic tube sitting between the film spool and top cap, not all developing tanks have these, it slide down the centre of the top cap and fits into some notches in the centre of the central spool, it allows you to rotate the central spool and film spool while the film is developing to help agitate the chemicals, although shaking the tank works just as well.
Top Cap- This screws onto the top of the developing tank and has a hole in the top that allows chemicals to be poured into the tank without letting any light in.
Top-Top Cap - This is the grey plastic cap that fits on top of the top cap and stops any chemicals from coming out if you shake or drop the tank while it is developing.
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