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Electrum is a naturally occurring alloy of gold and silver, [1] [2] with trace amounts of copper and other metals. Its color ranges from pale to bright yellow, depending on the proportions of gold and silver. It has been produced artificially and is also known as "green gold". [3]
Electrum, a naturally occurring alloy of silver and gold, develops a greenish cast with increasing silver content, ranging in color from green-yellow (for proportions of silver between 14% and 29%) to pale green-yellow (for proportions of silver between 29% and 50%). [10]: Fig. 2 It was known to the ancient Persians as long ago as 860 BC. [4]
Crown gold (silver, copper) Electrum (silver) Purple gold (aluminum) Rhodite ; Rose gold (copper) Tumbaga (copper) White gold (nickel, palladium) Indium
Different colors of silver–copper–gold alloys. ... The coins of Lydia were made of electrum, which is a naturally occurring alloy of gold and silver, ...
Bronze, gold, silver and electrum (a naturally occurring pale yellow mixture of gold and silver that was further alloyed with silver and copper) were used. Silver coins from about 700 BC are known from Aegina Island. [3] Early electrum coins from Ephesus, Lydia, date from about 650 BC. [4]
Gold parting is the separating of gold from silver (and other metallic impurities). Gold and silver are often extracted from the same ores and are chemically similar and therefore difficult to separate. The alloy of gold and silver is called electrum. [1]
The metal to color should be completely free from oxide and grease. Protective clothing, gloves and goggles should be used in a well-ventilated area or outdoors. Black for silver . Items are immersed in a 2.5% solution of potassium or sodium sulfide, after the appearance of the color wash objects well and wax or varnish it. [26]
The color silver pink is displayed on the right.. The color name silver pink first came into use in 1948.. The source of this color is the Plochere Color System, a color system formulated in 1948 that is widely used by interior designers.