Hello Jan,
When I hear a C-major chord I see a multi-hued melange of pastel colors. The colors shade into each other without blending. Its really very odd but at the same time very pleasing and soothing. For example: If it is an augmented or diminshed 13th chord then I see even more colors.
Something that really shocks me is that depending on the emotional mood I'm in, I'll see a different hue for every tonal key I hear:
C: From Blue to Deep Red
C#: From Blue-Green to Crimson
D: From Green to Orange-Crimson
D#: From Olive-Green to Orange
E: Yellow
F: From Apricot to Yellow-Green
F#: From Orange to Green
G: From Red to Bluish-Green
G#: From Crimson to Blue-Green
A: From Violet to Indigo
A#: From Agate to Deep Blue
B: From Indigo to Violet
Cheers,
CD
