cobalt blue
Quick Summary
Cobalt blue is a pigment that consists of cobalt oxide and alumina, creating a strong, greenish-blue color. Historically, cobalt compounds have been used for centuries to give glazes and ceramics a blue hue. This pigment was first documented in 1835.12
Cobalt itself is a ferromagnetic metal used in heat-resistant and magnetic alloys. While cobalt compounds were used for coloring long before the metal was isolated, the name "cobalt" was applied to ores that were later found to contain poisonous arsenic and the element cobalt.2
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Chinese potteryThe Yuan dynasty (1206ā1368)ā¦evidence of the use of cobalt blue, probably imported from the Middle East, is seen in its application as an underglaze pigment on fragments dating to the late 8th or early 9th century that were unearthed at Yangzhou in 1983. The occasional use of underglazed cobalt continued in the Northernā¦
Read Moreā¦evidence of the use of cobalt blue, probably imported from the Middle East, is seen in its application as an underglaze pigment on fragments dating to the late 8th or early 9th century that were unearthed at Yangzhou in 1983. The occasional use of underglazed cobalt continued in the Northernā¦
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potteryPaintingCobalt blue, ranging in colour from grayish blue to pure sapphire, was widely used in East Asia and Europe for blue-and-white porcelain wares. Cupric oxide gives a distinctive series of blues, cuprous oxide a series of greens, and, in the presence of an excess ofā¦
Read MoreCobalt blue, ranging in colour from grayish blue to pure sapphire, was widely used in East Asia and Europe for blue-and-white porcelain wares. Cupric oxide gives a distinctive series of blues, cuprous oxide a series of greens, and, in the presence of an excess ofā¦
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stained glassMaterials and techniquesā¦a molten stateācopper for ruby, cobalt for blue, manganese for purple, antimony for yellow, iron for greenāsheets of medieval glass were produced by blowing a bubble of glass, manipulating it into a tubular shape, cutting away the ends to form a cylinder, slitting the cylinder lengthwise down one side, andā¦
Read Moreā¦a molten stateācopper for ruby, cobalt for blue, manganese for purple, antimony for yellow, iron for greenāsheets of medieval glass were produced by blowing a bubble of glass, manipulating it into a tubular shape, cutting away the ends to form a cylinder, slitting the cylinder lengthwise down one side, andā¦
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