This is going back to 20-30 years ago, but the M42 that I used to see through my Dad's old 8" Celestron SCT were varying shades of reds and yellows. It was AMAZING. We lived in the Cascade foothills in Washington State. I picked the hobby back up again last year and I was really disappointed with the M42 that I saw from suburban Seattle. Only blue around the Trapezium.