What did Cobalt Ore Purification for Blue-and-White look like?

Blue-and-white patterns on white porcelain body appear deep blue. Imported cobalt produces rich color with iron-rust spots; domestic cobalt produces softer, more uniform tones.

How did Cobalt Ore Purification for Blue-and-White work?

Cobalt earth ore → crushed → elutriated to remove light impurities → gravity separation → roasted to oxidize and remove sulfur/arsenic → elutriated again → refined cobalt pigment obtained → mixed with glaze medium → painted → covered with transparent glaze → high-temperature reducing firing.

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青花瓷钴料提纯

Cobalt Ore Purification for Blue-and-White

Refining and purifying cobalt earth ore by removing iron and manganese impurities to ensure pure, vivid cobalt blue color development. The Yuan Dynasty used imported 'Sumali qing' cobalt from Persia.

青花瓷钴

Scientific Principle

Cobalt blue coloration: Co²⁺ ions in silicate glass appear blue (d-d electron transitions). Purification removes Fe³⁺ and Mn⁴⁺ to ensure cobalt blue purity.

青花瓷钴料提纯

Cobalt Ore Purification for Blue-and-White

Scientific Principle

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