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Randy's Red Cone 5

Code: G2826X
Modification Date: 2015-10-30 17:50:16

A popular Gerstley Borate based iron-red glaze.

MaterialAmountPercent
Silica29.725.4%
Kaolin5.04.3%
F-4 Feldspar19.816.9%
Talc13.911.9%
Gerstley Borate31.727.1%
Red Iron Oxide15.012.8%
Bentonite2.01.7%
 117.10  

Notes

There is much more information about this glaze at http://gerstleyborate.com.

The Boraq Gerstley Borate substitute works well in this recipe.

Iron Red glazes look a little different in a flow tester

Iron Red glazes look a little different in a flow tester

Melt flow test comparing two cone 6 iron red glazes fired to and cooled quickly from cone 6. Iron reds have very fluid melts and depend on this to develop the iron red crystals that impart the color. Needless to say, they also have high LOI that generates bubbles during melting, these disrupt the flow here.

Iron Red glazes look a little different in a flow tester

G2896 Ravenscrag plum red iron red cone 6 glaze.

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By Tony Hansen

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