Final answer:
The first step in manual film processing is development. It is followed by stopping, fixing, washing, and drying. Sensitivities to developing chemicals can lead to allergic reactions, making protective gear essential.
Step-by-step explanation:
The first step in manual film processing is development. This step involves immersing the exposed film in a chemical bath to reduce the silver halide crystals to metallic silver, creating a visible image. After development, the film goes through subsequent steps which include stopping, fixing (to make the image permanent), washing (to remove all chemicals), and finally drying.
Photographers developing a sensitivity to film chemicals and experiencing rashes is most likely due to exposure to the developing solutions which can cause allergic reactions or dermatitis over time. This is why it's important for anyone working with development chemicals to use proper protective gear, like gloves and aprons, to minimize skin contact.
The collodion process mentioned was indeed a challenging method in photographic history requiring a portable darkroom. It's fascinating to note the lengths to which photographers like Nadar went to pursue their art, such as developing glass negatives in a hot air balloon.