Keum-boo is a technique of applying very thin pieces of gold to another metal. Originally, a Korean technique used by the Japanese, Chinese, the Romans and the Greeks.
Through a subtractive process – employing acid and usually, heat – the other metals present are depleted, leaving a layer of pure gold. This process requires an object that contains at least some gold. Jane uses keum boo frequently in her beautiful work.
#14k overlay code
*** The Code of Federal Regulations 16, Part 23.5. If the sterling silver is plated with another metal, such as nickel, before application of the gold, it cannot be considered Vermeil. The heavy plating is achieved through electroplating or fire-gilding. (Pronounced “vermay”) – Vermeil must be 14k or higher and contain 2.5 microns (100 microinches) of gold over sterling silver. Due to the hazards of working with mercury, this type of process is seldom used today.
The amalgam (an alloy of mercury and another metal) is applied to the metal and heated until the mercury is boiled off. It is a process that involves combining powdered gold with mercury and forming a paste. Gilding is a surface application of gold that doesn’t involve electricity. Heavy gold plate must be 14k or higher and contain 2.5 microns (100 microinches) of gold. The gold present, must be at least 1/20th of the total weight of the item. It (now) is “.925 sterling silver with a 40-mils-thick outside layer of 18K yellow gold for a look of 14K.” per the HSN. See “For Further Research” below for more information. This is a marketing idea from the Home Shopping Network.
Gold plate must be 14k or higher and be at least. Gold Electroplate must be 14K gold and be at least. The total weight of gold must be no less than 1/40th of the weight of the piece and less than 1/20th. This is also reflected in the following list. There is also a consideration of quality: what is the underlying material and how well does the gold stay put. The following list is organized by: quality in DESCENDING order with number 9 being the thinnest application and 1 the heaviest application of gold. Items designated as “gold filled” can be up to 200 times thicker than the heaviest gold electroplating…” “Gold filled items are created by using heat and pressure to permanently fuse a layer of karat gold over a less costly base metal…” “Gold electroplating, especially with the advent of super hard plating materials, are widely used on designs which have intricate or complex shapes.” Here are some great quotes from Artisan on the difference between gold plating, gold filled/gold overlay: “The most important difference is layer thickness. 200 grams.ĭepletion Gilding from the archaeological site: Sitio Conte in Panama. Carats are used for measuring the weight of diamonds and other gem stones. 18K would be 18 parts gold to 6 parts of another metal. 24K is pure gold – there are no other metals in it. Carats – Gold fineness is measured in Karats. It is 14k with the gold representing 1/20th the weight of the metal. As a real life example: Rio Grande sells a double clad, 14/20 gold filled metal. Translation: mark the thickness (i.e: 1/20) and then mark the karat (i.e.: 10k) in either order. G.P.” for an item plated with 2 microns of 12 karat gold.)” **Quote from the Federal Trade Commission: Guides for the Jewelry, Precious Metals, and the Pewter Industries.
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