Metallurgical assay and the U.S. Mint continue to produce precious metal bullion coins for collectors and investors. The precious metal purity and content of these coins is guaranteed by the respective mint or government, and, therefore, the assay of the raw materials and finished coins is an important quality control. In the UK, the Trial of the Pyx is a ceremonial procedure for ensuring that newly minted coins conform to required standards. Metallurgical assay A metallurgical assay is a compositional analysis of an ore, metal, or alloy. Some assay methods are suitable for raw materials; others are more appropriate for finished goods.
Coins of the Indian rupee of Copper-nickel. However, these 5 rupee and 10 rupee coins were not the part of the Hasta Mudra series. The 5 rupee and 10 rupee coins were issued for common circulation in 2007, 2008, 2009 with changed designs and continued to be minted until the introduction of the Rupee Symbol series in 2011. In 2011, RBI issued a series in denominations of 50p, ₹1, ₹2, ₹5, and ₹10. The 50p, ₹1, ₹2, and ₹5 designs are identical except the absence of the rupee symbol in 50p coin. The ₹10 coin continued to be issued in bimetallic issues as previously. Because