Tom Turner’s Non-Running Zinc/Titanium glaze.

I see and feel that my making days are over and have decided to publish my non-running crystalline glaze. Realize that I had my chemicals, my porcelain, my kiln, and my firing schedule. My glaze was formulated with Kona A-3 feldspar, long not available, and a recent test with Custer ran some. If you choose to try this I am sure some reformulation will be necessary. Glazes react differently on different bodies and certainly in different firing schedules.

My glaze is an adjusted glaze from Ralph Bacerra, our countries foremost Ceramic Art Genius. Here are three glazes Ralph gave out in 1976 at an ACC-SE workshop in Mississippi. I was teaching at Clemson and my graduate student talked to Ralph as he wanted to pursue crystalline glazes. I chose to go with the feldspar based one, #3, 30 some years later..

Ralph Bacerra Crystalline Glaze 1

  • Frit 3124    80
  • Zinc            65
  • Silica            4
  • Titanium      5
  • Bentonite     3
  • Copper         3

 

Ralph Bacerra Crystalline Glaze 2

  • Frit 2106    100
  • EPK             20
  • Zinc             50
  • Nickel 2%     3.4
  • Rutile  3%     5.1
  • Bentonite       4

And the one I chose to work with on the right was initially reduction fired, no slow cooling. All further tests were electric with slow cooling.

Ralph Bacerra Crystalline Glaze 3

  • Custer                      92.3
  • Zinc                         56.2
  • Whiting                   17.9
  • Silica                       26.3
  • Rutile                         7.1
  • Copper                       4.0
  • Bentonite                   4.0

reduction

 

Tom Turner’s Non Running Crystalline Glaze

  • Kona A-3 Feldspar       108
  • Zinc                                50
  • Whiting(Pfizer Vicron)  12
  • Silica                              32
  • Titanium                          2
  • Bentonite                         4
  •  Lunar Green
  • Copper                              8
  • Rutile                                8

The firing schedule was as follows for cone 9 down and cone 10 at 2 or 3.

  1. 200F per hour to 250F hold 20 minutes
  2. 350F per hour to 1800F, hold 30 minutes(outgassing).
  3. 350F per hour to 2295F.
  4. Drop 1000 per hour to 2245F, hold one hour.
  5. OFF

Try this and adjust schedules as necessary.

Electric.

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2 thoughts on “Tom Turner’s Non-Running Zinc/Titanium glaze.”

  1. Stephen Stuchell

    What do you mean
    “ The firing schedule was as follows for cone 9 down and cone 10 at 2 or 3.”
    I can’t make sense of it
    Lol
    Thanks Tom for passing this knowledge
    You are truly a legend in our time

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