I looked at the films of all 116 directors who had at least five movies on my list of 2,200 top US-grossing films (1994-2015). The table below shows the 30 directors who make Hollywoodâs longest movies.
A gold alloy that is 50% gold and 50% other metals is 12 karat gold because it is only half pure gold. Alloys used in jewelry making range from 9 karat gold, which is approximately 37% gold, to 24 karat gold, and are required to be stamped and hallmarked according to purity.y mixing gold with other metals, or alloying it, gold is made stronger, which makes it durable enough to wear more often without experiencing wear. A variety of metals are commonly used to alloy gold, including silver, copper, nickel, iron, zinc, tin, manganese, cadmium, and titanium.
Uses of Gold. 1  Some investment and collectors coins are still made from gold. 2  Gold is used in all different types of jewelry. 3  Some gold salts are used in medicine as they have anti-inflammatory properties. 4  In modern times, injectable gold has been proven to help to reduce the pain and swelling of rheumatoid arthritis and tuberculosis. 5  Colloidal ... Gold use to be used to measure how much currency was worth until the world moved to finite money. 2  Gold is used in all different types of jewelry. 3  The higher the content of gold in a piece, the higher the caret rating. 4  Pure gold is not used as jewelry because it is too soft and would be damaged and misshapen too easily.