In some rotary-tube
processors, maintaining the developer temperature at
37.8 ± 0.15°C (100 ±0.25°F) can be difficult, and often
some loss of developer temperature occurs. The amount of
developer-temperature loss can vary based on the design of
the rotary-tube processor and the ambient conditions. Since
the developer is the most critical step in the process,
compensating for developer-temperature loss will help to
optimize the performance of the process and improve the
quality of the processed film.
The best way to compensate for loss of developer
temperature is by increasing the developer time (from the
standard time of 3:15). The amount of developer-time
extension can be determined approximately by the visual
appearance of the density of processed film. The preferred
method for determining the exact amount of developer-time
extension required is to use KODAK Controls Strips.
Process C-41 to monitor the process.