DRAFT: This module has unpublished changes.

Glaze Assignment 1

Glaze Base and Color Blend

 

Source: Cone 5-6 Glazes (Ceramics Arts Daily book)

Glaze Recipe: Odyssey Base Δ 5-6

Ingredients

Grams/100g. batch

Grams/1000g batch

Gerstley Borate

20

200

Whiting

10

100

Nepheline Sulfate

30

300

EPK/Kaolin

10

100

Silica

30

300

Batch Total Weight

100

1000

I used two different clay bodies for my test tiles: The white clay is from an unknown bag given to me at the end of last semester, and the red clay is Death Valley. Both are Δ 10 clays.

 

Instructions:

  • Mix up 1000g. of your recipe.
  • Divide into 10 cups equally by sight (Approx. 100g./cup)
  • Add the following color variations to base (one in each cup) and blend or sieve.
  • Dip on numbered Δ 6 tiles – 3 coats:
    • One thin coat
    • One thicker coat
    • Final thicker coat

                                                                             Test tile numbers/Firing

 

 

Colorant Added to Base

Color when fired

White

Δ 6 ox.

Red

Δ 6 ox.

White

Δ 6 red.

Red

Δ 6 red.

 1 

Base Only

 *see test tile gallery

1

1

13

13

 2 

Zircopax 7%

  *see test tile gallery

2

2

14

14

 3 

Red Iron Oxide 0.5%

 *see test tile gallery 

3

3

15

15

 4 

Copper Carbonate 3%

 *see test tile gallery 

4

4

16

16

 5 

Chrome Oxide 0.5%

 *see test tile gallery 

5

5

17

17

 6 

Cobalt Carbonate 0.75%

  *see test tile gallery

6

6

18

18

 7 

Chrome Oxide 0.15%

 *see test tile gallery 

7

7

19

19

 8 

Chrome Oxide 1.0%

 *see test tile gallery 

8

8

20

21

 9 

Chrome Oxide 2.0%

 *see test tile gallery 

9

9

21

23

 10 

Tin Oxide 5%

Chrome Ox. 0.15%

  *see test tile gallery

10

10

22

24

 11 

Tin Oxide 2%

Chrome Ox. 0.1%

  *see test tile gallery

11

11

23

25

 12 

Mason 6600 Black Stain 6%

  *see test tile gallery

12

12

24

27

 

        

Required Test

        

Choose from list/Discuss with Instructor

         

Optional/Extra Test

 

*Because I used 12 cups instead of 10, I divided 1000÷12 = 83.3333 and figured the percentages from that number to adjust for less base in the cups.

 

List of Possible Colorants

Yellow Iron 2%

Cobalt Carbonate 1% + Chrome 2%

Red Iron Oxide 3% + Titanium Dioxide 4%

Nickel Oxide 3%

Red Iron Oxide 0.5%

Mason 6600 Black Stain 6%

Iron Oxide 10% + Rutile 4% + Cobalt Carbonate 1%

Any Commercial Stain 3%

Copper Carbonate 3.5%

Any Commercial Stain 6%

Copper Carbonate 6%

 

Copper Carbonate 3.5% + Rutile 5%

 

Chrome 0.2% + Tin Oxide 7.5%

 

DRAFT: This module has unpublished changes.

Glaze Assignment 2

Triaxial Blends

 

A triaxial blend is an excellent tool for learning about glazes and materials. For this test I am testing crosses between a white base glaze (G13), chrome oxide 2%, and cobalt carbonate 0.5%

 

Glaze Base: G13
Source: Class glaze

 

Ingredients

Grams/100g. batch

Grams/1500g batch

King.

56.14

842.1

Dolomite

9.32

139.8

EPK/Kaolin

18.65

279.75

Talc

9.32

139.8

Zircopax

4.64

69.6

2% Bentonite

1.93

28.95

Batch Total Weight

100

1500

 

 

 

 

 

 

I decided to try adding the chrome and cobalt colorants to a base of G-13 glaze, thinking that I would get some nice opaque teal colors form the mix of the two colorants that would also be lightened by the white base. As I was mixing the colorants with the glaze before firing, it looked as if the colors would mix as I expected, but when they were fired, I discovered the blends with the chrome turned a muddy brownish color rather than shades of green. 

 

 

I was not able to determine exactly why this happened. My research showed that zinc will turn chrome a brownish color, and that magnesium will make chrome muddy, but I was not able to find a reason for why the glaze colors in my test reacted the way they did. I will continue to research this.

DRAFT: This module has unpublished changes.