G2826X - Randy's Red Cone 5

Modified: 2022-08-04 22:32:31

A popular Gerstley Borate based iron-red glaze.

Material	Amount
Silica	29.70
Kaolin	5.00
F-4 Feldspar	19.80
Talc	13.90
Gerstley Borate	31.70
Added
Red Iron Oxide	15.00
Bentonite	2.00
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.

Related Information

Iron Red glazes look a little different in a flow tester

A GLFL test for melt flow 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.

G2896 Ravenscrag Plum Red iron red cone 6 glaze

Original development of the G2896 recipe was done to match the chemistry of Randy's Red (a popular recipe). At the time we did not do any special firing schedule to encourage the growth of the red crystals.

Randy's Red cone 6 iron red glaze

Links

Materials	Boraq This Gerstley Borate substitute was available during the early 2000s. Its recipe and development are well documented but two materials are no longer available.
Glossary	Iron Red Glaze A type of ceramic glaze, typically fired around 2200F, where iron oxide in the cooling glass precipitates out to form a striking red crystalline mesh on the surface.
Recipes	G2896 - Ravenscrag Plum Red Cone 6 Plainsman Cone 6 Ravenscrag Slip based iron-red glaze. It can be found among others at http://ravenscrag.com.

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By Tony Hansen
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