[iamsomewalrus]

Key of D is typically black for me. For dorian F-natural is a soft shade of red. The B natural is purple.

F major is red. E-minor is a desert sand color.

[dehrmann]

You also have perfect pitch? Is this common for people with synesthesia?

[iamsomewalrus]

I don't have perfect pitch so it's not that I hear a note and see the color it's more like when I think of a note, chord, or mode I see a color in my minds eye. When I'm playing I am aware at a high level the notes I'm playing and their colors.