Molecular sieves have no color indicator. The loading condition can be measured via the change in weight or with the use of a sensor.
You can also mix molecular sieves with silica gel to indicate the loading state. However, we would like to point out that the mixture cannot be regenerated afterwards. The regeneration temperature of silica gel with color indicator is approx. 120°C – a temperature at which molecular sieve does not yet show any regeneration. At temperatures of 300°C, which in turn would be necessary for the regeneration of the molecular sieve, the silica gel would be destroyed.