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In the United States, the quality of gold-filled composite is defined by the Federal Trade Commission (FTC). If the gold layer is 10kt fineness, the minimum weight of the plated layer on an item stamped gold-filled marks according to the Federal Trade Commission (FTC) must equal at least 1 ⁄ 20th of the total weight of the item.
White gold is an alloy of gold and at least one white metal (usually nickel, silver, platinum or palladium). [5] Like yellow gold, the purity of white gold is given in karats. White gold's properties vary depending on the metals used and their proportions. A common white gold formulation consists of 90% wt. gold and 10% wt. nickel. [4]
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In 1896 he built the company's first factory, installing state-of-the-art machines for the production of gold chain, previously manufactured entirely by hand. [ 3 ] Friedrich Speidel sent his three sons, Albert, Edwin and Eugene to America to establish a branch of the family's jewelry chain manufacturing business. [ 4 ]
[4] A polychromatic Greek necklace with butterfly Krishna Roy pendant. In Ancient Greece, delicately made gold necklaces created with repoussé and plaited gold wires were worn. [4] Most often these necklaces were ornamented with blue or green enameled rosettes, animal shapes, or vase-shaped pendants that were often detailed with fringes. [4]
Colloidal gold is a sol or colloidal suspension of nanoparticles of gold in a fluid, usually water. [1] The colloid is coloured usually either wine red (for spherical particles less than 100 nm) or blue-purple (for larger spherical particles or nanorods). [2]
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