Cone 03 White Stoneware/Engobe

Code: L3685U
Modification Date: 2019-11-13 12:02:18

A white burning body with enough added frit to produce a cone 03 stoneware or white slip for use on a matching red stoneware.

Nepheline Syenite10.09.8%
Tile #6 Kaolin42.041.2%
Ferro Frit 311025.024.5%
National Standard Bentonite5.04.9%


This is both a slip (engobe) and body recipe. It is part of a development project during 2014 (spanning mixes from L3685A to T) to create a low fire stoneware system of body, slip (this) and glaze. This slip matches the firing shrinkage of that body (but not of standard less vitreous terracottas).

This project started life as the popular Fish Sauce slip. That recipe has an unbelievable 10% bentonite. I questioned the logic of that much of a high-iron dirty cheap raw bentonite in a recipe containing low-iron low-plastic expensive Grolleg kaolin. I switched to highly plastic 6Tile kaolin and halved the bentonite, this gives as good or better whiteness. Of course this could fire whiter if Grolleg was used and plasticized with VeeGum or Bentone, but the amount of the latter needed would double or triple the cost of the recipe. The amount of whatever bentonite is used can be tuned to match the drying shrinkage of the body (using bi-clay strips).

This recipe is also plastic for throwing as a body, but it needs a little more bentonite (for better trimming). In a later version of this recipe, U1, we increased the bentonite to 5%.

Because at cone 03 feldspar is a filler rather than a flux, I traded it for the amount of frit required to get the degree of vitrification needed to match the firing shrinkage of the body. The frit is active, it basically is the glue that holds the fired matrix together, that glues the slip to the body. This works much better than frits in common use.

The silica is here to make it easier to fit glazes and to match the thermal expansion of terra cotta bodies (on which this can be used as a slip).

The frit also amplifies the color of any stains added, that means you can make colored slips from this same recipe, apply them at the leather hard stage and finish with a clear coat of glaze (start with 10:90 mix of stain and this recipe, some stains will need more, some less). This creates the possibility of single fire low temperature stoneware for brush-on glazes (although you will likely want to bisque before glazing for dipping the clear).

To use this as a slip, gel the slurry so that it will hang on and stay put after dipping ware into it.

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 White Stoneware/Engobe" keywords="A white burning body with enough added frit to produce a cone 03 stoneware or white slip for use on a matching red stoneware." id="109" date="2019-11-13" codenum="L3685U">
<recipeline material="Nepheline Syenite" amount="10.000" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Tile #6 Kaolin" amount="42.000" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Ferro Frit 3110" amount="25.000" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Silica" amount="20.000" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="National Standard Bentonite" amount="5.000" unitabbr="kg" conversion="1.0000" added="0"/>
<url url="" descrip="Recipe page at"/>

By Tony Hansen

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