Processing Clay: Mixing from a recipe

Mixing clay from a recipe is probably a safer bet than digging up your own clay as more or less you will know its contents.

We looked at mixing one of our stoneware clays, Ash White. Personally, I like throwing with this clay as its quite stable when throwing and especially if you starting to learn how to throw. It is also a recipe very easy to mix and it doesn’t have many materials.

Ash White: (Percentage dry material)

  • Ball Clay                     75
  • China Clay                 25

12325123_1099200633426429_1704232924_nFirst of all, you grab all the dry ingredients and measure them on a scale individually and place them on a container together so they can be mixed together into a consistent slurry.

After the materials are mixed place them on a clean, dry plaster bat and do the same steps as you have done with the dug up clay. (note on the picture, Duncan placing the Ash White onto a plaster bat for terracotta, earthenware, stoneware and porcelain don’t mix Duncan – contamination:)

 And finally clay is wedged up and is ready for use. And when I say finally i don’t really mean finally because you can add other stuff like grog which is basically fired clay or kiln furniture that is then crushed into small pieces and then added to clay bodies. This has its advantages as it will make the clay body more stability and it is particularly good if you making large sculptural work. However, adding to much grog will make the clay short (crumbly-not very flexible).

Other interesting prepared clay bodies:

Bone China(1250-1260°C):

  • Bone ash                   50
  • China clay                 25
  • Cornish stone          25

Dental Porcelain (1200°C):

  • China clay                   5
  • Potash feldspar        81
  • Flint                             14

Raku body (1260-1280°C):

  • Fireclay                       50
  • China clay                  15
  • Ball clay                      15
  • Grog                             15
  • Talc                               5

Fireclay Body (1260-1280°C):

  • Fireclay                        60
  • China clay                   20
  • Ball clay                       20

 

 

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Published by

tonidej

BA (Hons) 2nd Year Ceramics student at Cardiff Metropolitan University. Love experimenting with material and techniques and work on a range of medium.

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