UGR-06002     Large jar with underglaze-blue decoration of banana

                              leaves and underglaze-red decoration of a dragon among

                             lightly engraved sea waves

Ming Dynasty, Ching-te-cheng, Long-zhu-ge kiln, imperial ware, unmarked.

Height: 36cm, Mouth diameter: 14cm, Foot diameter: 25cm, Inside foot height: 0cm, Weight: 6170g

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Straight mouth, wide shoulder, flat foot. Sectors connected on the belly.  

An ingenious presentation of pigment combination: the shoulder and foot are decorated with underglaze-blue broad banana leaf lines, where sea waves are engraved on the body joined by underglaze-red dragon chasing after a pearl.

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Underglaze porcelain as we know it today is decorated with copper oxide with a coating of transparent glaze applied on top. When burned in reductive flames under high temperature, copper oxide becomes highly sensitive, and can be easily volatilized. Note that production failure is substantially increased when underglaze-blue pigment with a different melting point, cobalt oxide, is being used at the same time for decoration. This is truly a rare and sought after piece.

The underglaze-blue pigment shows a diffused dark bluish green color with some green spots. Iron rust marks are present at thickly glazed areas.  

The majority white surface glaze with visible bubbles is tinted with green and conveys a glittery, moist feeling.

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No glaze at the bottom; uneven dark iron rust is present. Moist and smooth tactile sensations.

Since copper oxide is easily volatilized while under high temperature, an untainted crimson is rare. Brush strokes frequently diffuse with occasional black, green or yellow spots.

The imported underglaze-blue pigment contains high iron oxide which leaves rust marks on the glaze surface after combustion.

 

Clear bubbles with green and yellowish brown iron rust spots.

Refined raw clay material used contributing to a smooth and pure white clay quality.