Mid-level clouds depict in olive colours in the Night Microphysics RGB. Both, the red and the green colour beam show stronger intensity than the blue colour beam. In the absence of high Cirrus clouds, the BTD (IR12.0 - IR10.8) is near zero which leads to a strong red contribution on a scale reaching from -4 to +2 degrees.
Mid-level clouds also show a strong contribution on the green colour beam due to positive BTD. As these clouds are colder than low-level water clouds, the blue colour beam is weak.