Growing up, I was taught that rainbows have 6 colors. Red, orange, yellow, green, blue, and purple. It makes sense as it goes from primary color (red) to secondary color (orange) back to primary (yellow) back to secondary (green), to primary (blue) and finally ending on secondary (purple). Indigo is a blend of blue and purple, but purple is a blend of red and blue…..
In: Physics
Isaac Newton believed that the universe is mathematically perfect, and that things come in sevens: 7 notes in a musical scale, 7 days of the week, 7 objects in the solar system, 7 colors in the rainbow. I’ve heard different explanations for why indigo specifically, including that it relates to trade/commerce. Regardless, indigo is not a distinct color the way blue or purple is, and it probably doesn’t make sense to include it in the “official” colors.
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