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ChengHua small Vase
A very thin, eggshell thin, one picture shows the design with a flashlight from the inside, the light going through the porcelain because it is so thin, it was under water for a long time and some of the Doucai over paint enamel is coming off, only because it was added after the high fired glaze
My list of things I look for on Chenghua porcelain
1) The porcelain - Chenghua took out any iron in the porcelain clay and from the glaze. This made the porcelain whiter and the glaze super smooth, he also added more alumina and less calcia and this made the porcelain more vitrified, the clay was really white and the glaze was transparent to show the white porcelain clay
The glaze was improved by reducing the amount of flux in the glaze which allows it to mature at a higher temperature enabling more of the residual batch material to be dissolved in the glaze during firing. This produced a smooth glossy glaze with minute bubbles evenly distributed and Jade like smooth
2) The thickness of the porcelain, Chenghua liked small porcelain things that he could hold in his hand and admire, Very thin eggshell like and if you use a flashlight you can see through it
3) The early Chenghua porcelain was very white but later they used a bone color porcelain, he worked the porcelain more than any other emperor and because of this, Chenghua porcelain pieces are the most highly collected in the world
4)Chenghua mixed imported cobalt blue called samali blue with the local cobalt pitang and this gave the chenghua
period the most beautiful refined cobalt blue in Chinese history and very easy to distinguish from other
cobalts that China used
My vase shows all this, so its real until proven fake
All of the basic characteristics you've mentioned can be found in porcelains from every period from the Ming right into the 20th C. The quality of drawing coupled with the vase's shape and how the foot was shaped all indicate a much later date of manufacture. Well into the 20 C. I think.
Find a few examples of known authentic examples in Museum collections and the difference will be quite apparent.
Here are some links to the Palace Museum Collection. Pay particular attention to the quality of the drawing.
The British Museum Collection examples
I hope this helps.
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