The color Red symbolizes Love, Passion, Courage, Strength, Sacrifice, Anger & even Danger. The color red can be associated with the happiest feelings as well as with the worst. Its symbolism can lie on both ends of the spectrum. What comes to mind when you hear the color red? IF not listed, feel free to add in the comment.
I hear C Maj as the color red. It doesn't work in reverse though. When I hear the word "red" however, it does make me think of that note, that and Japanese Maple leaves.
You might have Synesthesia. I used to play the organ. I play the keyboard sometimes. My grandma played the piano. She told a story, one of the music teacher had Synesthesia. The teacher used to hear music & see colors in his mind. How extraordinary. Thanks for sharing :) 👍