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The most accurate and widely used method, with an accuracy of 2-3 parts per ten thousand (0.02%), is the Fire Assay (Cupellation) method. This involves taking a small scraping from the article, typically about 250 milligrammes, weighing it accurately, wrapping it in lead foil with some added silver, cupelling it in in a furnace at about 1100°C to remove all base metals and then placing the resulting gold-silver alloy button in nitric acid to dissolve out the silver (known as ‘parting') and re-weighing the resulting pure gold. This is the standard reference technique used by the national Assay laboratories worldwide for Hallmarking and is covered in the International Standard, ISO 11426:1993.
expressed in parts per thousand. Sterling silver is indicated by 925, which means it is 92.5% silver or 925 parts of silver in every 1000 of the silver alloy. The current legislation is the Hallmarking Act 1973. Following amendments to the Act in 1998 and January 1999, the sponsor's mark, fineness mark and Assay Office mark remain compulsory. But the Date Letter indicating the year of hallmarking, which had been in use from 1478, is now a voluntary mark, as are the traditional fineness symbols, the Lion Passant for 925 Silver, Britannia for 958 Silver and the Orb for 950 platinum. Platinum was only recognised as a hallmarkable precious metal since 1976.
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