Ash Glazes

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Last year I started to use an ash glaze and really liked it. I have been doing some testing to change the color and I have been testing out other ash glaze recipes.

All of the test tiles are stoneware. They were fired in a gas kiln to cone 10 (2350 F). Each test tile was dipped once and then a second time halfway down.

Base Ingredients

Base Ash Glaze
  • 31  -  Whiting
  • 24  -  Kentucky Ball Clay
  • 22.5  -  Silica
  • 15  -  Oak Wood Ash
  • 5  -  Custer Feldspar
  • 2.5  -  Dolomite

Add the below colorants to base glaze

Ash Glaze 1
  • 8  -  Red Iron Oxide
  • 3.8  -  Cobalt Corbonate
Ash Glaze 2
  • 0.25 -  Cobalt Carbonate
  • 1  -  Iron Chromate OR (0.5  -  Red Iron Oxide & 0.5  -  Chromium Oxide)
Ash Glaze 3
  • 5  -  Copper Carbonate
Ash Glaze 4
  • 3  -  Tin Oxide
  • 1.6  -  Copper Carbonate
Ash Glaze 5

Do not use the base ingredients and only use these two ingredients for this ash glaze.

  • 50  -  Red Art
  • 50  -  Wood Ash

Val’s LP Matte Modified Glaze Tests

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I liked the look of this glaze and decided to test it out. The first picture in the table is the original glaze formula. The glaze is on both stoneware and porcelain. The test tiles were fired in a gas kiln to cone 10 (2350 F). Each test tile was dipped once and then a second time halfway down.

(I moved this over to a new site and haven’t had a chance to upload the images yet)