Many people remember the colors of the rainbow by the acronym ROY G. BIV. For red, orange, yellow, green, blue, indigo and violet. Well, the color indigo just made news. Indigo gets its name from the ...

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Before synthetic dyes, people would use nature’s pigments to color fabrics. Dried insects were used to make reds, while saffron and even cow urine were used to dye things yellow. Blue required indigo ...