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Message: <blockquote data-quote="dissagm" data-source="post: 13063714" data-attributes="member: 405564">machan carrot gana maninne mehemai  wikiye gatte hode..Karat purity is measured as 24 times the purity by mass: <img src="http://upload.wikimedia.org/wikipedia/en/math/9/6/6/966a8b3575dd6ba21ad3d3973604fd8b.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /> where <img src="http://upload.wikimedia.org/wikipedia/en/math/d/9/f/d9fd29e7668708398a7554ed4bf9f017.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /> is the karat rating of the material,<img src="http://upload.wikimedia.org/wikipedia/en/math/6/1/b/61b5068b5b759ca61b3567ecf0c74628.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /> is the mass of pure gold or platinum in the material, and<img src="http://upload.wikimedia.org/wikipedia/en/math/1/f/a/1fa926410c869d167ee022e2f5dd7520.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /> is the total mass of the material. Therefore, 24-Karat gold is fine (99.9% Au <a href="http://en.wikipedia.org/wiki/W/w" target="_blank">w/w</a>),  18-Karat gold is 18 parts gold 6 parts another metal (forming an  alloy), 12-Karat gold is 12 parts gold (12 parts another metal), and so  forth. In England, the carat was divisible into four grains, and the grain  was divisible into four quarts. For example, a gold alloy of <img src="http://upload.wikimedia.org/wikipedia/en/math/8/c/4/8c450112da78e8d4236e7e50fac9fff6.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /> fineness (that is, 99.2% purity) could have been described as being 23-carat, 3-grain, 1-quart gold. The Karat system is increasingly being complemented or superseded by the <a href="http://en.wikipedia.org/wiki/Millesimal_fineness" target="_blank">millesimal fineness</a> system, in which the purity of <a href="http://en.wikipedia.org/wiki/Precious_metal" target="_blank">precious metals</a> is denoted by parts per thousand of pure metal in the alloy.</blockquote>

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