ARTWORK by James Q. Jacobs

Raku Glaze Formulas

Fat White Crackle
Cobalt Flash
Louden's Red
Zowie

Cone 10 Formulas  |  Cone 6/7 Formulas

If you test these formulas, I would be interested in your comments.
If you adjust the formulas, please send me any reformulations. Contact.

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JQ's Fat White
gerstley borate
300
custer feldspar
180
ferro frit 3134
72
epk kaolin
12
tin oxide
30
zircopax
6

Mill the zircopax if necessary. Sieve at 80 minimum.

This plaque was sprayed with a porcelain slip while green, to produce the ultra-pure white.

MCC's White Crackle
gerstley borate
80
nepheline syenite
20
tin oxide
2 - 8 %
JQ's Cobalt Flash
gerstley borate
320
silica
60
feldspar
20
cobalt carbonate
25
whiting
12
bone ash
8
copper carbonate
8
Reduce the cobalt quantity to produce
a copper mirror glaze.

I applied the glaze thick on top of the plate, thin on the underside (left image).  This formula will show some crackle where thin.  Click on the image to the left to see the crackle detail.

Both the above pieces were spray glazed. The designs are achieved using thick art paper cut outs.
Louden's Red


Raku vase by Louden Kiracofe.

I found this exciting red crackle at an art show in Durango, CO. I searched out the artist, Louden Kiracofe, and obtained the formula. Louden agreed to share it with others.

gerstley borate 80
cornwall stone 20
Mason stain # 6033 - "Sunset" 20 to 25

 

Detail of Louden's Red crackle.

Glassy Copper Sand
gerstley borate
130
nepheline syenite
32
silica
30
copper carbonate
30
red iron oxide
10
cobalt carbonate
5

This formula has sufficient silica for the copper flash colors to persist. I placed a piece in direct sunlight for one year to ensure the stability of the copper flashing.
Copper Sand
gerstley borate 800
bone ash 200
copper carbonate 50
cobalt carbonate 25
tin oxide 12

This formula will copper flash, however, after a few years the copper flashing colors will dissappear, leaving the blue colors. I also tested this formula in direct sunlight. The color changed rather quickly.

Red Iron Raku

This recipe may benefit from a little more experimentation, especially with slight adjustments in the quantities of the metals. The result is a burgundy red in reduction, opaque and smooth where thick and with copper flashing. With oxidation the result can be a green crackle that is very sensitive to cooling rate. The lampbase at the right illustrates the range of results. The green area may have fired hotter, or an area of oxidation in the firing process resulting in the two distinct color areas on one piece.

gerstley borate
400
nepheline syenite
100
bone ash
40
silica / flint
40
red iron oxide
25
copper carbonate
20
zircopax
15
lithium carbonate
10
cobalt carbonate
6
Zowie
gerstley borate
80
nepheline syenite
20
lithium carbonate
10
copper carbonate
5
red iron oxide
1
Patina
gerstley borate
80
bone ash
20
copper carbonate
10
tin oxide
1.25
cobalt carbonate
0.25
For Blue Patina decrease copper carbonate to 2.

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©1999 James Q. Jacobs. All rights reserved. Inquiries Welcome. Contact.