Negative drying after Developing help please

Started 4 months ago | Discussions thread
A Marcus Forum Member • Posts: 91
Re: Negative drying after Developing help please
2

Hang the film using a clip at both ends. The bottom clip adds weight, this prevents the film from curling back on itself. Wet your fingers in the final rinse and use them to squeeze the film. The idea is to remove water droplets. Many mix the finial rinse, which contains a wetting agent, using distilled water. Allow the film to air dry.

The enemy is residual minerals and foreign materials. The enemy is also lingering water droplets. Drips on the film support uneven drying. We want uniform drying because film entails a binder (glue) that holds the imaging forming material to the plastic film base. This binder is gelatin. Gelatin is used because it is transparent and permeable. Fluids easily enter and exit because, when wet, the gelatin swells and this opens up the structure. As film dries, the gelatin shrinks almost back to its original thickness. If water droplets are present, that area will likely display differences in the shrink rate. The result is what we term as “water marks”. These marks are generally free of trapped minerals, however they have a different index of refraction. We try to mitigate by re-washing and re-drying, but often this fails. Best to avoid by using high quality wetting agent in the final rinse.

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