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In about the 9th century, Chinese artisans abandoned the Han blue colour they had used for centuries, and began to use cobalt blue, made with cobalt salts of alumina, to manufacture fine blue and white porcelain, The plates and vases were shaped, dried, the paint applied with a brush, covered with a clear glaze, then fired at a high temperature.
New Martinsville Glass Company used an extensive list of colors in their glassware. A list of colors follows: Amber, Ruby, Evergreen, Amethyst, Cobalt Blue, Ritz Blue, Rose, Jade, Pale Blue, Light Green, Pink, Black, Yellow [5]
By 1500 BC, the peoples of the Indus Valley were creating gold earrings and necklaces, bead necklaces, and metallic bangles. [citation needed] Before 2100 BC, prior to the period when metals were widely used, the largest jewellery trade in the Indus Valley region was the bead trade. Beads in the Indus Valley were made using simple techniques.
There is a blue and white Jingdezhen stem cup, that has a silver stand and a gold cover (this dated 1437), all decorated with dragons. Presumably many such sets existed, but recycling the precious metal elements was too tempting at some point, leaving only the porcelain cups. [15]
Black gold is a type of gold used in jewelry. [14] [15] Black-colored gold can be produced by various methods: Patination by applying sulfur- and oxygen-containing compounds. Plasma-assisted chemical vapor deposition process involving amorphous carbon; Controlled oxidation of gold containing chromium or cobalt (e.g. 75% gold, 25% cobalt [3]).
Pliny the Elder wrote that lapis lazuli is "opaque and sprinkled with specks of gold". [citation needed] Because the stone combines the blue of the heavens and golden glitter of the sun, it was emblematic of success in the old Jewish tradition. [citation needed] In the early Christian tradition lapis lazuli was regarded as the stone of Virgin Mary.
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