{"product_id":"ultralite-kiln-keum-boo-covers-red-brass","title":"Ultralite Kiln Keum-Boo Covers (2) Red Brass","description":"\u003cp\u003eThe Ultralite Kiln Keum-Boo Covers are a set of two red brass covers, each 4\" in diameter, specially designed for use with the Ultra-Lite Kiln when performing Keum-Boo firing. These covers provide the controlled environment needed to achieve proper bonding temperatures for this exacting gilding technique.\u003c\/p\u003e\n\n\u003cp\u003eKeum-Boo is an ancient Korean gilding technique used to apply thin sheets of gold to silver, creating silver gilt with a permanent, durable finish. The process begins by depleting the surface of sterling silver to bring up a thin layer of fine silver. Twenty-four karat gold foil is then applied using heat and pressure — a process known as mechanical gilding — to produce a permanent diffusion bond between the two metals.\u003c\/p\u003e\n\n\u003cp\u003ePure precious metals such as gold and silver share a very similar atomic structure, giving them strong bonding potential. Heating these metals to a temperature between 500–700°F increases atomic movement. When pressure is applied, an electron exchange occurs at the surface between the two metals, forming a permanent diffusion bond — one that takes place well below the soldering temperature of either metal.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSpecially designed for use with the Ultra-Lite Kiln during Keum-Boo firing\u003c\/li\u003e\n\u003cli\u003eSupports the ancient Korean technique of applying 24-karat gold foil to fine silver\u003c\/li\u003e\n\u003cli\u003eEnables controlled heat for achieving diffusion bonding in the 500–700°F range\u003c\/li\u003e\n\u003cli\u003eRed brass construction\u003c\/li\u003e\n\u003cli\u003eSold as a set of two covers\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eRed Brass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter\u003c\/th\u003e\n\u003ctd\u003e4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity\u003c\/th\u003e\n\u003ctd\u003e2 covers per set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Kiln\u003c\/th\u003e\n\u003ctd\u003eUltra-Lite Kiln\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eKeum-Boo firing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBonding Temperature Range\u003c\/th\u003e\n\u003ctd\u003e500–700°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e2 red brass Keum-Boo covers (4\" diameter each)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JEC UltraLite Beehive","offers":[{"title":"Default Title","offer_id":43581662331094,"sku":"122.134","price":48.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/ultralite-kiln-keum-boo-covers-2-red-brass-otto-frei.jpg?v=1719957468","url":"https:\/\/www.ottofrei.com\/it\/products\/ultralite-kiln-keum-boo-covers-red-brass","provider":"Otto Frei","version":"1.0","type":"link"}