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Keum-boo (Korean: 금부; also Geumbu, Kum-Boo or Kum-bu—Korean "attached gold") is an ancient Korean gilding technique used to apply thin sheets of gold to silver, to make silver-gilt. Traditionally, this technique is accomplished by first depleting a surface of sterling silver to bring up a thin layer of fine silver.
OSP Pair of table salts, the interiors gilded to prevent corrosion. 'Bleeding' of the copper can be seen on the rims. Old Sheffield Plate (or OSP) is the name generally given to the material developed by Thomas Boulsover in the 1740s, a fusion of copper and sterling silver [1] which could be made into a range of items normally made in solid silver. [2]
The monogram 'G III' is split at the forehead level. The inscription, 'CHATHAM ISLANDS' is above the King's portrait. The dates '1760–1820' are inscribed below the chin. The date '2001' appears below the truncation. The inscription, 'FIFTY DOLLAR MILLENNIUM SILVER PIECE' goes from behind the King's portrait around to the front at eye level.
Standing Cup by the William B. Durgin Company, gold, circa 1900. The William B. Durgin Company (1853–1924) was a noted American sterling silver manufacturer based in Concord, New Hampshire, and one of the largest flatware and hollowware manufacturers in the United States.
In 1792, the gold/silver price ratio was fixed by law in the United States at 15:1, [11] which meant that one troy ounce of gold was worth 15 troy ounces of silver; a ratio of 15.5:1 was enacted in France in 1803. [12] The average gold/silver price ratio during the 20th century, however, was 47:1. [13]
The factory added to its products sterling goods and high-grade nickel-silver-plated ware, both flat and hollow. Still later, by experiment, Mr. Wallace devised a new process of manufacture from steel. It made a less bulky, firmer, and a lighter base for silver plating. Also in 1871, Wallace, his sons, and sons-in-law formed a new company.
An even larger rise in the price of silver after the First World War caused the Royal Mint in London to reduce the silver content of the sterling coinage. But silver never returned to the 15½:1 ratio of the first half of the 19th century, and the predominant long term trend was that silver continued to decline in value against gold.
Sterling silver is an alloy composed by weight of 92.5% silver and 7.5% other metals, usually copper. The sterling silver standard has a minimum millesimal fineness of 925. Tiffany & Co. pitcher ( c. 1871 ) having paneled sides and repoussé design with shells, scrolls and flowers; top edge is repousse arrowhead leaf design