Thursday, 5 November 2015

Earthenware Glaze Tests (low fire)

I have been experimenting with different low fire glazes. These glazes are for earthenware with a low firing temperature to cone 04. (1060 degrees Centigrade, or 1940 Fahrenheight)

This is partly because I have been working with found objects from the clay recycling room and these  shapes are usually made from earthenware, the clay utilised by the Introduction to Ceramics students in the studio.

I am interested in both glazes that run or form a drip, and surface texture. 

thickly applied Majolica (left) & Willing White (right) 

My first experiments were with thickly applied majolica and willing white. The test pieces were dipped 6 times and the glaze was about 1/2 centimetre thick. Whilst interesting, the results weren't quite what I was looking for.

Vardis blue over Power Black (left)
Power Black over Vardis blue (right)
Next, I experimented with double dipping of glazes, combining gloss finishes (such as power black) with textured finishes (Vardis blue).

Turquoise and Power black

It was also interesting to see how different glazes responded to being dipped first or second. Depending on this the resulting texture changed.

copper wire (left) steel wire (right)
with Vardis Blue

I then became interested in experimenting with layering different glazes combined with wrapping either copper or steel wire. 

Turquoise and Power black over steel (left)
Turquoise and Power black over copper (right)

Copper wire on bare earthenware (left)
Vardis Blue over steel (right)


Roxie Power Black - Cone 04

Frit 3134          25%
Frit 3195          15%
Frit 3249          35%
EPK                 25%
BIO                  8%
Mang. Diox     8%

Turquoise - Cone 04

Gherstly Borate  35%
Neph Sye            5%
EPK                    5%
Flint                  42%
Lithium Carb      8%
Super Copax       8%
Copper Carb       3%

Vardis Blue - Cone 04

Neph Sye          20%
EPK                  20%
Flint                  11%
Lithium Carb      5%
Barium Carb     43%
Copper Carb       7%

Willing White

Gerstley Borate   35%
Lithium Carb        8%
Neph Sye              5%
EPK                      5%
Flint                    42%
Zircopax              10%

Linda Arbuckle Maolica

Flint 3124          57.16%
EPK                     9.4%
Kona F4             14.9%
Bentonite             1.2%
Super Pax           13%
Neph Sye            5.42%
Rutile                 0.25%

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