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Oily Residue


LeeU

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Recently I ordered a commercial clay that is new to me - haven't fired it yet but have made a number of items. It is MC63B from Sheffield - the site notes that "63B Moist White Stoneware Pottery Clay is a dense, tight stoneware at Cone 6 . It is a blend of Kaolin, Fire, and Ball Clays. Contains No Talc and has good tooth for wheel throwing."

 

I've noticed, when cleaning my tools and rolling pin etc. that there is consistently a strong, essentially "oily", residue left -not visible to the naked eye-and it takes a little bit of scrubbing to remove it from wood and plastic.

 

Any idea what this is? My thought is from the ball clay but I really don't remember enough about clays to even know why I think that LOL   Thanks in advance-it doesn't matter, really, I'm just curious. 

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Dick:

I have used MacAloid, v-gum t, hectorites, and some bentones: only one of which imparted a greasy feel. I use mica for several reason, and it does feel oily. Now there is the possibility that a man- made ionic inhibitor was used, that would cause this. There are several ionic compounds that are economically feasible for use in clay to impart plasticity.

 

Nerd

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Doesn't seem gummy/slippery-feels oily and I can "cut" it with a natural soap, but it does not readily wash off even when being rubbed-but also it does not bead in water. I'll call Sheffield just out of curiosity. It doesn't hurt or affect anything, near as I can tell-just feels odd when washing up. Thx-

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Since this topic is about strange stuff in clay (oil)?? or something like oil.

Another topic of the week is what strange things have you found in commercial clay-I have a lot of additions to that topic.

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