search  current discussion  categories  glazes - cone 4-7 

glaze test for black friday, cone 6, ox.

updated thu 11 oct 01

 

Alisa og Claus Clausen on wed 10 oct 01






Glaze test for:  Black Friday, cone 6, ox.

Source:  Jeff Zamek



All tests fired on white, mid-range stoneware.

Fired in to cone 6 (1220c) in oxidation.



Firing ramp:

100c (212f) per hour to 600c (1112f)

150c (302f) per hour to 1100c (2012f)

100c per hour to 1220c (2228f)

15 - 30 minute soak depending on matts and glosses used.



Recipe:

20 Nepheline Syenite

15 Whiting

18 EPK

20 3134

17 Flint

10 Bone Ash



ADD

12 Mason Stain #6600

1 CMC



Note:

All raw materials measured up or down to nearest whole decimal.

Oxides used on percent basis to a 100 gram batch of glaze.



Substitutions:

Local Frit for 3134

Generic Black stain.  Omitted CMC.



Resulted in:

Semi matt black glaze.  Stayed where put and no discernable
difference where double dipped.   Very smooth surface.



Best regards, Alisa

in Denmark