Radioisotopes in carbon dating what women wish men knew about dating
It is impossible to tell the precious metal content of any item simply by looking at it.Precious metals such as old, silver, and platinum are too soft to use alone for making jewellery, cutlery and other goods.The most common gold compounds are auric chloride (Au Cl).A mixture of one part nitric acid with three of hydrochloric acid is called aqua regia (because it dissolved gold, the King of Metals). It is found free in nature and associated with quartz, pyrite and other minerals.It is a good conductor of heat and electricity, and is unaffected by air and most reagents.Gold is readily available commercially and its price changes day by day and is one of the most widely tracked commercial prices.Gold has always fascinated people and gold is certainly one of the very first metals known.Nobody knows who picked up a gold nugget first but it would have been because it was shiny.
The assay protects the consumer by ensuring sure that not too much base metal was used.
It is the most malleable and ductile metal; 1 ounce (28 g) of gold can be beaten out to 300 square feet.
It is a soft metal and is usually alloyed to give it more strength.
Gold is usually alloyed in jewellery to give it more strength, and the term carat describes the amount of gold present (24 carats is pure gold).
It is estimated that all the gold in the world, so far refined, could be placed in a single cube 60 ft. It is metallic, with a yellow colour when in a mass, but when finely divided it may be black, ruby, or purple.
Gold Assay It is critical from the public's perspective that there is confidence in the claimed purity of any particular item made from precious metals.