Darkroom humidity should be maintained in which range?

Maintaining darkroom humidity between 40 and 60% is essential for ensuring the proper handling and quality of photographic film and radiographic materials. This humidity range minimizes the risk of static electricity, which can lead to artifacts on the film and affect image quality. Additionally, higher or lower humidity levels can cause problems such as drying out film emulsion or creating condensation, both of which can hinder radiographic processing.

The 40 to 60% humidity range is ideal because it strikes a balance that allows for adequate film handling and processing while preventing both the adverse effects of too much moisture and the brittleness that comes with too little. Proper humidity control is crucial in preserving the integrity of the materials used in radiography, ensuring that the resulting images are of the highest quality.