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Ravenscrag Cone 10R Tenmoku

Code: GR10-K1
Modification Date: 2016-09-30 22:51:15
Member of Group: RV10

Plainsman Cone 10R Ravenscrag Slip based glaze. It can be found among others at http://ravenscrag.com.

MaterialAmountPercent
Ravenscrag Slip95.086.4%
Calcium Carbonate5.04.5%
Additions
Iron Oxide10.09.1%
 110.00  

Notes

Like a typical tenmoku, this fires to a brilliant deep gloss that will run if applied too thickly. It appears best on porcelain on white stoneware. Tiny iron silicate crystals grow on the surface (depending on the speed of cooling).
Adjust the calcium carbonate to fine tune the degree of melting.

Tenmokus made from Alberta Slip and Ravenscrag Slip

Tenmokus made from Alberta Slip and Ravenscrag Slip

GR10-K1 Cone 10R Ravenscrag Tenmoku (right) compared to Tenmoku made from Alberta Slip (left, it is 91% Alberta Slip with 5% added calcium carbonate and 2% iron oxide). Left is Plainsman P700 porcelain, right is H570. Tenmokus are popular for the way they break to a crystalline light brown on the edges of contours.

Compare Ravenscrag and Alberta Slip tenmokus at cone 10R

Compare Ravenscrag and Alberta Slip tenmokus at cone 10R

GR10-K1 Ravenscrag tenmoku (left) compared to Alberta Slip tenmoku GA10-B (center) and pure Alberta Slip (right).

Add 5% caclium carbonate to a tenmoku. What happens?

Add 5% caclium carbonate to a tenmoku. What happens?

In the glaze on the left (90% Ravenscrag Slip and 10% iron oxide) the iron is saturating the melt crystallizing out during cooling. GR10-K1, on the right, is the same glaze but with 5% added calcium carbonate. This addition is enough to keep most of the iron in solution through cooling, so it contributes to the super-gloss deep tenmoku effect instead of precipitating out.

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By Tony Hansen

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