What does developer do?

The function of the developer is to bring out the latent image held in the emulsion. This is achieved by a chemical reaction, acting on the silver, producing dark areas where it is light and bright areas where there is shadow. The negative is reversed later with the print. The two most important things to keep at the front of your mind are: the development time and the temperature. It is these two factors that ensure the ultimate image quality you later produce in the print. Too short a development time will produce too thin a negative, like wise too long a process time will make the negative too dence, leading to very short and very long print times.

Trouble loading a plastic spiral.

The plastic Paterson type of spool can be difficult to load. A common problem is the little metal balls that grip the film get stuck. Dont try to force the film through, if you do it will kink the negative leaving a half-moon shape. It can make the frame(s) useless. You will need to part the spiral and start again. A pain I know! Be gentle when removing the film, there is a chance of damage.

Damp or wet spool will not load, so make sure it is completely dry before use. Sweaty, damp or sticky fingers will make it difficult as well.

A too tightly rolled up 35mm film in its cassette can take a set that makes it tricky to load. So when rewinding the film back into the case dont over wind it after you hear it has released itself from the camera spool. With practice it is possible to leave a little bit of the leader poking out.