The fineness of the grain of a film is measured in RMS. The higher the RMS values, the larger the grain. With a value of 8 RMS, the Rollei RPX 25 is considerably finer-grained than most other films offered in the corresponding speed class (RMS 9.5 to 10)
Agitation: In the first 60 seconds continuously, then for 5 sec every 30 seconds.
Process temperature: 20°C/68°F
The development times given below are to be understood as guide values and refer to an average contrast of γ = 0.65. Due to individual processing conditions, deviations in times are possible.