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Cone 03 Terra Cotta Stoneware

Code: L3724F
Modification Date: 2018-06-04 10:46:38

An experimental Zero3 using Plainsman 3D clay

Plainsman 3D45.040.4%
National Standard Bentonite5.04.5%
Ferro Frit 311010.09.0%
Yellow Iron Oxide1.00.9%
Barium Carbonate0.30.2%


This is an experimental version of the Zero3 red low fire stoneware recipe where we were attempting to make use of a Plainsman material. While it worked version well we eventually decided to go back to the original concept of using pure Redart clay to make it useful in all of North America. You can find a link to that recipe, L3724C, below.

The original goal was a terra cotta clay with added frit to make it vitrify at cone 03. The previous version to this one, L3724E, has 5% frit, this one has 10%. The former has better red color as a slip, this one is better as a body itself. Although the development effort spanned a year, it ended in only partial success. It was found that this body (and many variations of it) was too volatile, there is too narrow a temperature window between too mature and too porous. When too mature, the fired shrinkage was very high, the color went from red to brown and the glaze was filled with bubbles from decomposition occurring within the over-fired body. When too open, the color was good but it was too susceptible to absorption of water into the matrix, this could be seen at sites of glaze imperfections where the water could get through. However, if you carefully watch glaze fit and make sure there are no imperfections in the glaze surface, this body could be successfully used at cone 04 to make quite strong ware.

However, as an engobe this appears to be a success. At the time we were working on a white fritted engobe, the L3685 series. The L3685T version turned out to also be a nice white-burning body producing a red color that varied in shade and intensity in response to slight temperature variations in the kiln. This imparted a flashing effect reminiscent of wood and salt firings.

Note again, we eventually went back to the L3724C recipe that uses just Redart as the clay. This is just a historical recipe that as part of the trail leading to the eventual Zero3 recipe.

Out Bound Links

In Bound Links

XML to Paste Into Insight

<?xml version="1.0"?>
<recipes version="1.0" encoding="UTF-8">
<recipe name="Cone 03 Terra Cotta Stoneware" keywords="An experimental Zero3 using Plainsman 3D clay" id="123" date="2018-06-04" codenum="L3724F">
<recipeline material="Plainsman 3D" amount="45.000" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Redart" amount="50.000" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="National Standard Bentonite" amount="5.000" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Ferro Frit 3110" amount="10.000" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Yellow Iron Oxide" amount="1.000" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Barium Carbonate" amount="0.250" unitabbr="kg" conversion="1.0000" added="0"/>
<url url="" descrip="Recipe page at"/>

By Tony Hansen

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