“In the seventeenth century Newton related colours to the notes of the diatonic scale; red for C, orange for D, yellow for E, green for F, blue for G, indigo for A, violet for B.”
Faber Birren
“[Charles] Fere discovered that red increased muscular tonus (in the human body) from a normal 23 units to 42 - orange increased the units to 35, yellow to 30, green to 28 and blue to 24 - all above normal.”
Faber Birren
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