The color sequence may also be recalled in reverse order with the mnemonic vibgyor. Another sentence sometimes used is "Read Out Your Good Book In Verse", referring to the Bible. This mnemonic is said to refer to the defeat and death of Richard, Duke of York at the Battle of Wakefield in 1460, or to his son Richard III being defeated at the battle of Bosworth Field in 1485. Īnother traditional mnemonic device has been to turn the initial letters of the seven spectral colors into a sentence, most commonly "Richard Of York Gave Battle In Vain" (or the slight alternative "Richard Of York Gained Battles In Vain"). This word can also be envisioned as a person's name, "Roy G. One is simply the nonsense word roygbiv, which is an acronym for the seven colors. Isaac Newton's color sequence (red, orange, yellow, green, blue, indigo, violet) is kept alive today by several popular mnemonics. The Munsell color system, the first formal color notation system (1905), names only five "principal hues": red, yellow, green, blue, and purple. Originally he used only five colors, but later he added orange and indigo to match the number of musical notes in the major scale. In line with this artistic tradition, Sir Isaac Newton divided his color circle, which he constructed to explain additive color mixing, into seven colors. In the Renaissance, several artists tried to establish a sequence of up to seven primary colors from which all other colors could be mixed. Illustration from Newton's Opticks, Fourth Edition, 1730. The uneven color division along the color circle correlates with the intervals of the musical major scale. Newton's color wheel that introduced indigo as a basic color.
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