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G2826X - Randy's Red Cone 5

Modified: 2020-03-03 08:18:43

A popular Gerstley Borate based iron-red glaze.

Material Amount
F-4 Feldspar*19.80
Gerstley Borate*31.70
Red Iron Oxide*15.00


There is much more information about this glaze at

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

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

G2896 Ravenscrag Plum Red iron red cone 6 glaze

Original development of this 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.


Iron red page at
Materials Boraq
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

XML to Paste Into Insight

<?xml version="1.0"?>
<recipes version="1.0" encoding="UTF-8">
<recipe name="Randy's Red Cone 5" keywords="A popular Gerstley Borate based iron-red glaze." id="63" date="2020-03-03" codenum="G2826X">
<recipeline material="Silica" amount="29.700"/>
<recipeline material="Kaolin" amount="5.000"/>
<recipeline material="F-4 Feldspar" amount="19.800"/>
<recipeline material="Talc" amount="13.900"/>
<recipeline material="Gerstley Borate" amount="31.700"/>
<recipeline material="Red Iron Oxide" amount="15.000" added="1"/>
<recipeline material="Bentonite" amount="2.000" added="1"/>
<url url="" descrip=""/>

By Tony Hansen

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