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Curious Question.


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I have an 04 clay body containing, Grolleg,  6 tile, C& C Ball clay Gerstley Borate, Silica, Talc and bentonite.  It throws like a dream and handles very well, however, it has a tendency to bloat in the bisque and no matter what glaze is used it will turn out matt.  Even the shiniest glossiest glazes on other bodies turn out a dull matt on this one.  Any ideas where to tweak this recipe to correct this glaze fault?  The percentages are as follows: Grolleg, 25, 6 tile 25, c&c ball clay 10 gerstley borate 30, Talc 5, Silica 5, Bentonite 2.  Any advice is appreciated.  Thanks,

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I agree with Wyndam, that the Ger Bor may be the culprit. Looks a bit high. What about cutting it in half in one test, and then remove it altogether in another.

You could replace with fritt, but this would make your clay body expensive.

The ger Bor is not adding any plasticity, just fluxing the clay. You might not need it at all.

TJR.

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There's a Val Cushing 04 body that is quite similar, fluxed with frit (and the talc). White, vitreous, dense, plastic.

 

Grolleg   25

Tile 6      20

C&C       15

Talc         5

3124       30

Silica        5

Macaloid   2

 

The GB in your recipe is going to cause solubility problems. If you try this recipe I would swap out the macaloid for  bentonite since macaloid is so expensive.

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