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Black is a case where making our own underglaze makes sense

I am using this on Polar Ice porcelain. This adds 20% black stain, 1.5% CMC gum and 5% bentonite to a 90:10 MNP and Nepheline Syenite mix. We mix this to have as high a specific gravity as possible (the CMC is an enabler for that). The lower water content is a key to this working well, it enables putting it on much thick enough in a single brush stroke (the commercial one we have won't do that). The freedom to fiddle with the recipe enables really tuning the way it goes and and fires.

Black underglazed bowl

Related Pictures

Our own black underglaze better accepts the clear overglaze


Black underglaze covers better

The commercial product was just not covering well enough. To get jet black required three or four coats. And we found that transparent dipping glazes did not cover well over it, even when it was bisqued on (upper left). By contrast, our own black (started from 90% MNP, 10% Nepheline Syenite and 10% black stain plus some CMC gum and bentonite) overglazed perfectly (upper right) compared with the commercial ones (upper left). And one brush stroke covered (although not as black as multiple coats of the commercial ones on the left). A further test with 20% black stain demonstrated that to be too high a percentage, it reacted with the overglaze.

This underglaze red is not working at all. Why?


Underglazes should normally be made as high specific gravity slurries. This is so that they will go on as thick as possible with one brush stroke (an obvious need for fluid brushwork designs). Something went wrong with this commercial red product, it is painting on far too thin and has very poor physical covering power and adhesion compared to the black underneath (of the same brand). Why? Because the specific gravity is only 1.22! A practical solution is to allow it to evaporate for a few days to raise that as high as possible while still being brushable.

Very low specific gravities on two commercial underglazes


Commercial underglazes with low specific gravities

AMACO and Crysanthos. 1.26 (67.5% water) and 1.22 (68% water)! The former is well below their recommended specific gravity of 1.4 (it still paints well but needs more coats and more time to dry and apply them). The Crysanthos, although having a lower specific gravity is more viscous and goes on thicker (so it likely contains more gelling agent). When doing underglaze decorative brushwork it is important to get adequate thickness with eachbrush stroke, so a higher specific gravity is better. This may be reason enough to consider making your own (by adding stain powders to a base and using Veegum CER to gel the slurry, slow down its drying and harden it well at the dried state).

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