Cobalt blue - online puzzles

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FCB !: D puzzle online from photo
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motorbike puzzle online from photo
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handmade egg puzzle online from photo
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ceramics online puzzle
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Spring Flowers puzzle online from photo
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sky online puzzle
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Ravenclaw puzzle puzzle online from photo
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view4 online puzzle
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view6 online puzzle
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Comunidad de caminantes puzzle online from photo
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view1a puzzle online from photo
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Online puzzle Cobalt blue

Cobalt blue

Cobalt blue is a blue pigment made by sintering cobalt(II) oxide with aluminum(III) oxide (alumina) at 1200 °C. Chemically, cobalt blue pigment is cobalt(II) oxide-aluminium oxide, or cobalt(II) aluminate, CoAl2O4. Cobalt blue is lighter and less intense than the (iron-cyanide based) pigment Prussian blue. It is extremely stable and historically has been used as a coloring agent in ceramics (especially Chinese porcelain), jewelry, and paint. Transparent glasses are tinted with the silica-based cobalt pigment "smalt".