Egyptian blue
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Egyptian blue, also known as calcium copper silicate, calcium copper tetrasilicate, or cuprorivaite, is a pigment with the chemical formula CaCuSi4O10 that was used in ancient Egypt for thousands of y
Egyptian blue
Pyxis made out of "Egyptian blue" faience: Imported to Italy from northern Syria, it was produced 750–700 BC. (Shown at Altes Museum in Berlin)
Blue faience saucer and stand, New Kingdom (1400–1325 BC)
Shades of blue
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Varieties of the color blue may differ in hue, chroma, or lightness, or in two or three of these qualities. Variations in value are also called tints and shades, a tint being a blue or other hue mixed
Egyptian blue
…Prussian blue – Synthetic pigment Egyptian blue shades – Variety of the color blue Becker, H. 2022. "Pigment nomenclature in the ancient Near East, Greece, and Rome." Archaeological and Anthropological…
Bluebonnet flowers
Indian 50 rupee note, obverse
Periwinkle flowers
Male Ruddy duck