I have seen the outer part of M42 in kind of a salmon rose. It was very easy to be seen. I did not believe my eyes, that's why I did not write it until today. But as I got it confirmed from two sides, here is how to do:
I had a longer Moon observation of about an hour. When the Moon went down, I immediatly switched over to M42. There was this very obvious rose (pink? I remember it as "salmon") colour.
It seems the colour sensitive parts of my eyes got stimulated by the bright Moon light, so I was able to see the colour.