digitalfire.com (glossy base glaze) site; as follows:
20 Wollastonite
20 Fritt 3134 (F 4108)
20 Potash Feldspar
20 Silica
20 China Clay
Danny uses ball clay rather than china clay. I have been mostly using a 50/50 mix of ball
clay and china clay. The substitution of ball clay for china clay does slightly lower the
maturing temperature of the glaze. I use fritt 4108, as 3134 is not available here. I think they
are fairly similar though, essentially they are a soft borax fritt.
On the right is the base glaze with 0.4 percent of chromium oxide. In the center is the base
with 0.4 chromium oxide, and 0.5 cobalt carbonate. On the left is the base with 0.4
chromium oxide, 0.5 cobalt carbonate, and 4 percent tin oxide. The tin oxide is trying its best
to make red from the chromium oxide, but the cobalt blue is making the red turn violet.
chrome-tin red on a 9 inch bowl (230mm).
One of the most exciting cone 6 glazes that I tested, and have started to use, is the chrometin red that I found on June Perry's web site, shambhalapottery.com. She has posted a
wonderful collection of glazes there for cone 6 and for cone 10, and it is a great resource for
any potter who wants to test glazes. I have used the chrome-tin glaze in the bowl in the
photo above. It is a bad photo unfortunately, but you can see from it that the glaze develops
an opalescent purple where it is thick, rather like the "bloom" of a ripe red plum.
The glaze is as follows:
21 Gerstley Borate
16 Nepheline syenite
11 China Clay
20 Whiting
32 Silica
5 Tin oxide
0.15 Chromium oxide
Nice purples can be made by adding very small quantities of cobalt to the glaze, or, if the
chromium oxide is left out, good blues can be made with additions of cobalt.
I glazed up some goblets and used the chrome-tin red on a number of them. One other
splendid characteristic of this red is that it does "break" nicely over detail, so the throwing
rings of the goblets show up well. The blue version of this glaze also shows detail well too.
Hi Peter....we used a varient of this glaze in my old pottery co-op. We named it after the
member who brought it to us.....she may have been responsible for the variation......this was
over thirty years ago! We fired it from ^6-^8....looked good at all those temps.
Jane's Base:
Frit 3134.........1000
Dolomite.........1000
Spodumene.....1000
Ball Clay..........1000
Flint................1000
As I recall it's a most forgiving glaze which is excellent for beginners. Those who worked at
^6++ developed lots of variations. Superpax and/or tin and rutile with oxides made many
interesting variations. (EX: Warm Green....500 pax; 150 dark milled rutile; 150 copper
carbonate. The rutile gives it a nicely mottled appearance)
Joe Shaw’s Lemon Frost ^6 ox –Donna Kat
September 6, 2012glazesharingLeave a comment
Joe Shaw
Recipe Name: Lemon Frost Matte
Cone: 6
Color: Pale Yellow
Firing: Oxidation
Surface: Matte
Amount
Ingredient
60
Nepheline Syenite
20
Strontium Carbonate
1
Lithium Carbonate
10
Ball Clay–Old Mine #4
9
Silica
100
Total
Additives
5
10
Stain
2
Titanium Dioxide
Cerdec Degussa Yellow
Bentonite
-----------------------------------------------------------------
Emerald – Cone 5/6
Gerstley Borate – 49
EPK (kaolin) – 19
Flint (silica) – 32
Chrome oxide – 2
Cobalt Oxide – 1
Bentonite 2%
This glaze has to be applied much thicker
than you would expect a glaze to go on.
Almost like a thin yogourt. The mug in the
illustration was fired to cone 5.
As you get hotter the green becomes
more uniform and “greener” much like the
area on the edges of the handle