Collectors Coins Tips and Info

Why use the number 24 as pure gold?

I realize that is pure gold, but do not understand why the number 24 was chosen. Does anyone know why 24 is pure gold and not any other number: for example, 100 carats of pure gold. Thanks

The karat system is increasingly being supplemented or replaced by the system of purity in which the purity of precious metals is denoted by parts per thousand of pure metal in the alloy. The carat (abbreviation ct or Kt) is a measure of purity of gold alloys. As a measure of purity, one carat is tfrac (1) (24) purity by mass: X = 24 , frac () (M_g M_m) where X is the number of carats of matter Mg is the mass of pure gold or platinum in the material, and Mm is the total mass of material. In the mid-16th century, the carat was adopted as a measure of the purity of gold, equivalent to the silique Roman ( tfrac (1) (24) of a golden solidus of Constantine I). As a measure of diamond weight, from 1575, the Greek measure was the equivalent of the Roman siliqua, which was Tfrac (1) (24) of a golden solidus of Constantine, but was probably never used for weighing gold. Http: / / en.wikipedia.org / wiki / Carat_ (purity)

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