Dec 25th 11 4:17 pm
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Re: Is this an example of Slip cast ? color changing zisha ?

by kongle » Dec 25th 11 4:17 pm

bearsbearsbears wrote:I should also add that I believe they're withholding the entire truth. From the appearance of the pot, a second clay is applied to the face of the pot and polished before firing, some of it rubbing off to expose the base clay at the edges. That's my novice potter opinion :)
Thanks so much for your information its all very cool. One thing that puzzles me is the layering of the clay.

I think the colour is not paint or wax. I think it is due to the firing.

I still can't confirm the last photo of the lid edge. It looks like there are two clay layered together? Or is this how it looks being the effect caused by firing?

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Dec 25th 11 6:20 pm
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Re: Is this an example of Slip cast ? color changing zisha ?

by JBaymore » Dec 25th 11 6:20 pm

kongle wrote:I think the colour is not paint or wax. I think it is due to the firing.
If the materials is "coming off" like you mention it is likely not fired.

If is IS fired and is still coming off like that, then is it NOT a good job of firing or materials formulation. Or both.

best,

...........john

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Dec 25th 11 6:23 pm
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Re: Is this an example of Slip cast ? color changing zisha ?

by JBaymore » Dec 25th 11 6:23 pm

kongle wrote:I still can't confirm the last photo of the lid edge. It looks like there are two clay layered together? Or is this how it looks being the effect caused by firing?
It is possible from looking at that photo, that the piece is formed out of one main clay body that has a coarser texture. Then a smoother texture slip (liquid emulstion of clay and other ceramic materials) of a contasting color has been applied over the underlying clay body before firing.

Then it is my guess that this fired slip coating has also had a non-ceramic post-firing finish appiled to it.... which is what is coming off.

best,

.............john

Dec 25th 11 11:42 pm
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Re: Is this an example of Slip cast ? color changing zisha ?

by kongle » Dec 25th 11 11:42 pm

JBaymore wrote:
kongle wrote:I still can't confirm the last photo of the lid edge. It looks like there are two clay layered together? Or is this how it looks being the effect caused by firing?
It is possible from looking at that photo, that the piece is formed out of one main clay body that has a coarser texture. Then a smoother texture slip (liquid emulstion of clay and other ceramic materials) of a contasting color has been applied over the underlying clay body before firing.

Then it is my guess that this fired slip coating has also had a non-ceramic post-firing finish appiled to it.... which is what is coming off.

best,

.............john
yeah, that must be it, thanks.

Does having a slip - over make it much less valuable than a non slipped pot?

Dec 31st 11 2:12 am
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Re: Is this an example of Slip cast ? color changing zisha ?

by kongle » Dec 31st 11 2:12 am

JBaymore wrote:
kongle wrote:I still can't confirm the last photo of the lid edge. It looks like there are two clay layered together? Or is this how it looks being the effect caused by firing?
It is possible from looking at that photo, that the piece is formed out of one main clay body that has a coarser texture. Then a smoother texture slip (liquid emulstion of clay and other ceramic materials) of a contasting color has been applied over the underlying clay body before firing.

Then it is my guess that this fired slip coating has also had a non-ceramic post-firing finish appiled to it.... which is what is coming off.

best,

.............john
I think i found the answer to the black coating ... i still don't think it is paint because I tested it with a lighter to emulate some firing temperaturetures. If paint then it should burn off .. but instead i was able to put a shinny black gloss back on it .. it was really fun after polishing off the carbon and seeing I have restored the original surface.

Does that plausible?

Mar 14th 12 11:04 pm
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Re: Is this an example of Slip cast ? color changing zisha ?

by oolongfan » Mar 14th 12 11:04 pm

Sorry to resurrect a moribund old post but since I own three Jian Shui pots, I could not resist adding my two cents...

My pots are from Yunnan Sourcing and I have never had any problems with color/coating wearing off.

My pots have a highly polished whereas your appears rather dull in the photos that you posted. My uneducated guess is that your pot was not finished properly...hence problems with the coating wearing off.

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Mar 15th 12 1:49 am
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Re: Is this an example of Slip cast ? color changing zisha ?

by TIM » Mar 15th 12 1:49 am

oolongfan wrote:Sorry to resurrect a moribund old post but since I own three Jian Shui pots, I could not resist adding my two cents...

My pots are from Yunnan Sourcing and I have never had any problems with color/coating wearing off.

My pots have a highly polished whereas your appears rather dull in the photos that you posted. My uneducated guess is that your pot was not finished properly...hence problems with the coating wearing off.
You are comparing apple and orange. Just my 2 cents

Mar 15th 12 8:12 pm
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Re: Is this an example of Slip cast ? color changing zisha ?

by oolongfan » Mar 15th 12 8:12 pm

TIM - Could you elaborate? Are you suggesting that the pot on this thread is not Jian Shui? Or not made in the same fashion as my posts from YS?

I am just curious since the pot in question, looked to my uneducated eyes, like a Jian Shui pot (albeit not as shiney/polished).

Your posts are always informative...and you have far more knowledge and experience than me... so I would be interested why you consider this pot and mine like comparing apples and oranges :) What type of pot is this?

Thanks

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Mar 18th 12 5:41 am
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Re: Is this an example of Slip cast ? color changing zisha ?

by bagua7 » Mar 18th 12 5:41 am

I have a question for you: what tea(s) are you brewing in your JS pots?

Cheers.

Mar 18th 12 7:06 pm
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Re: Is this an example of Slip cast ? color changing zisha ?

by oolongfan » Mar 18th 12 7:06 pm

I brew all sorts of Oolongs in my JS teaware..since my teapots are all either JS or porcelain. I will break out the porcelain only when trying a new type of Oolong.

I prefer darker roasted oolongs..like high fired or charcoal roasted TGYs and Da hong Pao...but do drink some 'greener' light roasted TGY's from both Anxi and Tawain. I have variously sized and shaped JS pots-since I find both shape and size can really enhance certain teas...like for example, a small 130 ml Xi Shi pot can really enhance the orchid honeysuckle vegetal quality of a high grown lightly roasted Ali Shan or TGY.

I just got a beautiful small hong ni pot from Mandarin Tearoom this weekend so I am testing it against my various JS pots. I will post my result...at some distant time. The size variance alone will probably slant results as the hong ni is only 40 ml whereas my smallest JS pot is 130 ml!

Have you any JS piece? would love to hear about them if you do. as you know,, I have a Jian Shu teaware thread started already...so maybe further questions can be posted over there:

http://www.teachat.com/viewtopic.php?f=36&t=17042

My attempt to get some more responses to this thread as well as keep this one on track ;)

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May 9th 18 9:59 am
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Re: Is this an example of Slip cast ? color changing zisha ?

by nixingpottery » May 9th 18 9:59 am

ha , it is nixing pottery teapot , it is from Qinzhou, Guangxi :lol: