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.
Ad. Although many people may know gold for its use in jewelry â which is how about 65% of it is used â it has a number of other uses. About 25% is used in industrial applications in ceramics, electrical, and electronics applications. specialized use is in the powder called gold tin purple, gold tin precipitate, or purple of Cassius, which is used for tinting enamels and manufacturing a special type of glass called ruby glass. Ruby glass is used on the windows of office buildings as well as on mirrors that are used in space.