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Vinegar and clay.


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#1 Claypple

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Posted 17 June 2013 - 12:01 AM

I like using vinegar when I play with the clay. I do it when I connect scored areas, and sometimes I brush it on the clay to smooth the surface.
Vinegar is acidic, the clay is slightly alkaline, so it increases the plasticity of the clay when you brush the vinegar on it.
Just one question: would it increase warping of the clay?

#2 Pres

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Posted 17 June 2013 - 06:33 AM

I like using vinegar when I play with the clay. I do it when I connect scored areas, and sometimes I brush it on the clay to smooth the surface.
Vinegar is acidic, the clay is slightly alkaline, so it increases the plasticity of the clay when you brush the vinegar on it.
Just one question: would it increase warping of the clay?


Been using vinegar in my slip for years, never noticed any warping. I haven't done any studies as to the negative effects of vinegar either, but don't think there are any.

Simply retired teacher, not dead, living the dream. on and on and. . . . on. . . .                                                                                 http://picworkspottery.blogspot.com/


#3 Claypple

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Posted 17 June 2013 - 08:37 AM

I didn't think either, but yesterday I used it a lot when I worked with the porcelain, and gosh my piece was warping while drying out!

#4 TJR

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Posted 17 June 2013 - 09:02 AM

Clayppl;
I am thinking that you might have made an uneven application of vinegar. If you worked on one side only, or more on one side than the other, the clay slab would warp towards you.I tend to go easy with the vinegar, using it only to repair hairline cracks.
TJR.

#5 Claypple

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Posted 17 June 2013 - 11:52 AM

Clayppl;
I am thinking that you might have made an uneven application of vinegar. If you worked on one side only, or more on one side than the other, the clay slab would warp towards you.I tend to go easy with the vinegar, using it only to repair hairline cracks.
TJR.


I think you are right

#6 TJR

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Posted 17 June 2013 - 01:06 PM


Clayppl;
I am thinking that you might have made an uneven application of vinegar. If you worked on one side only, or more on one side than the other, the clay slab would warp towards you.I tend to go easy with the vinegar, using it only to repair hairline cracks.
TJR.


I think you are right


Ain't ceramics wonderful?
TJR.

#7 KathleenHamlet

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Posted 17 June 2013 - 03:17 PM

I like using vinegar when I play with the clay. I do it when I connect scored areas, and sometimes I brush it on the clay to smooth the surface.
Vinegar is acidic, the clay is slightly alkaline, so it increases the plasticity of the clay when you brush the vinegar on it.
Just one question: would it increase warping of the clay?


I do have another point with vinegar and porcelain, esp very alkaline porcelain and very hard water. If you use too much vinegar, as I was, the vinegar and hard water combined to form chunks of calcium, which will blow out during the firing. Now its distilled water and no vinegar.

#8 Marcia Selsor

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Posted 17 June 2013 - 03:44 PM

I use a few drops of vinegar in my throwing water when I am using porcelain. It may be silly but I think I throw taller and thinner pieces.

Marcia

#9 Claypple

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Posted 17 June 2013 - 08:12 PM

[

Ain't ceramics wonderful?
TJR.


I have never been happier in my life. All these years in Medicine looks like a waist of my life now.




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