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The origins of this saturated shade can be traced to lapis lazuli, a gemstone that has been used in art and jewelry since 7500 B.C. A brilliant blue stone accented by white or golden flecks, lapis ...
Cobalt blue is a blue pigment made by sintering cobalt(II) ... jewelry, and paint. Transparent glasses are tinted with the silica-based cobalt pigment "smalt". ...
Cobalt blue, a pigment of cobalt oxide-aluminium oxide, was a favourite of Auguste Renoir and Vincent van Gogh. It was similar to smalt, a pigment used for centuries to make blue glass, but it was much improved by the French chemist Louis Jacques Thénard, who introduced it in 1802. It was very stable but extremely expensive.
Cobalt-based blue pigments (cobalt blue) have been used since antiquity for jewelry and paints, and to impart a distinctive blue tint to glass. The color was long thought to be due to the metal bismuth.
Blue also varies in shade or tint; darker shades of blue contain black or grey, while lighter tints contain white. Darker shades of blue include ultramarine, cobalt blue, navy blue, and Prussian blue; while lighter tints include sky blue, azure, and Egyptian blue (for a more complete list see the List of colours).
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