Mint-made errors 5 centavos. Foreign coins struck on a U.S coin planchet or vice versa are very uncommon and hold a high value. Authentic error coins should not be confused with coins that are damaged after being minted, which is known as post-mint damage (PMD) or post-strike damage (PSD). Mints purchase long strips of metal which are fed through blanking machines that punch out disks known as blank planchets (or simply as planchets or blanks) on which coins are struck. This determines the size and shape of eventual coins. The punched disks are first known as "type-1 blanks (or planchets)". The disks
Rewari metal work dug in the ground to keep the water more cool. The basic raw materials used in the practicing of the craft are brass and copper sheets. Other than this to join the shaped pieces of various utensils soldering materials "suhaga" (it is a mixture of borax and water used to join metal pieces), brass, copper and zinc are used. Industries mainly copper & brass rolling mills are continuously producing best quality coils, strips, sheets, plates, and circles by the hot rolling and cold rolling methods. There are many manufacturers associated with copper and brass. Another process that involves washing of