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LANGYAO VASE & PETER'S REQUEST FOR A PICTURE OF THE BOTTOM.

by Andrew

Hi Peter,
have taken 4 pictures from indoors, near natural light coming in from the window.
Have to say that the base is not snow or milky , bright white.
the colour changes ever so slightly when the base is rotated, however, it always appear to be more a mellow, pale bluish grey tone or off white tone, with a satin type sheen, not full & glassy.
Has the cracks & crazing giving it a yellowish aspect when viewed at a certain angle...dont know if this helps, but some of the republican wares have a newer cleanere looking glassy snow white base with a few black glaze contractions, otherwise I have not seen much hands on.
also the unglazed foot has been carefully trimmed to the inside edge & overall has a pronounced yellowish hue to the paste...does NOT look faked with permanganate or other type stain!
regards, Andrew.

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May 22, 2011
 vase
by: peter

Andrew, I know nothing about age cracks in the bisquit, only in the glaze. Are you meaning crackling or splits (body cracks)?

Have you ever looked at this? It may explain some of the things regarding crackles (crackling).
https://www.chinese-antique-porcelain.com/crackles-and-glaze.html
https://www.chinese-antique-porcelain.com/glaze-characteristics.html

Don't pay too much attention to the crackling. It is only one piece of the whole picture, and crackles may and ARE artificially created (see Ge wares).
If crackling cannot be felt with a finger nail, then it means it is below the transparent layer of the glaze, and most likely artificially created. But, if it can be felt, that does not necessarily mean it is genuine/natural, but it can be...

Simply said, crackling or glaze cracks/hairlines are the result of different expanding/contraction rates of ceramic body and glaze, if one expands or contracts faster, then the glaze may crack. This can be controlled in the kiln.

And, there are always exceptions. Complete absence of crackles does not necessarily mean an item must be new, the same way as the presence of crackles does not guarantee its age, but it CAN be a sign of age.
May 22, 2011
 REPLY & FURTHER QUEST FOR KNOWLEDGE
by: Andrew

Thanks for the more precise estimate Peter.

I brought up a comment earlier, is it possible to determine the likelihood of porcelain age cracks appearing in the biscuit, as being older, than the same age cracks appearing in the overglaze near the biscuit in question?
Or is this too difficult to determine...the piece in mind is a late Qing dynasty vase with these cracks on foot collar & on overglazed base?
Your thoughts most welcome.
again thankyou for your knowledge & perserverance,
Andrew.
May 21, 2011
 Langyao vase
by: peter

Hi Andrew,
Thanks for the pictures. They only reinforce my impression that it is late Qing. Nice vase, BTW.

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