[RolandF]

In post #12 I wanted to explain this effect "nachdunkeln". Some yellow pigments are not stable according to my experiences. In case a colour loses its yellow portion through dissolution of those pigments it inevitably will change its general character.
A simple example: In case of green lossing its yellow portion it will change towards blue.
The Ju88 fuselages in Berlin wear a "RLM 70/71" camouflage which can be described as two greys with a slight greenish touch. The colour has NOT faded, it looks darker.
And this might be the effect of "nachdunkeln" which is described in the official paper.
Michael Ullmann, from memory some "chromium" pigments come to my mind. Can the pigment be named exactly which has caused this colour shift? Isn´t it possible the ominous brown-green is nothing more than an attempt to create more stable greens by adding yellowish-brown pigments?

Servus

Roland