But what color is indigo? Turns out, that's a big question. A mix of blue and purple — and affectionately known in the Livingetc office as 'blurple' — indigo sits on the color spectrum ...

“It has no justification in experiment exactly; it just represents something that he’s imposing upon the color spectrum by analogy with music ... Newton introduced two colors—orange and ...

Place the sheet of paper where you see color. Watch the rainbow appear on the paper. On another sheet of paper, draw a rainbow that has red, orange, yellow, green, blue, indigo (blue-violet), and ...