Creating a glaze from Plainsman 3B clay

3B as a glaze

Total:100.00

Auto Unity Formula

Notes

*This is a calculation to derive a recipe with the same (very similar) chemistry to G1947U while employing the highest possible percentage of 3B clay to contribute it.

This was done in Insight-live. I started with 3B, assuming that all (or most) of the Al2O3 could be supplied by 3B. It was then a matter of supplying the oxides it was deficient in from other materials. I choose Freit 3110 as the source of KNaO because it contains almost no Al2O3 (that is what enables maximizing the percentage of 3B).

Pictures

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="3B as a glaze" id="268029" key="yvmLzo8N" date="2025-01-29" codenum="G4594"> <recipelines> <recipeline material="B Clay" amount="59.700" tolerance=""/> <recipeline material="Ferro Frit 3110" amount="7.200" tolerance=""/> <recipeline material="Silica" amount="14.400" tolerance=""/> <recipeline material="Whiting" amount="16.500" tolerance=""/> <recipeline material="Zinc Oxide" amount="2.200" tolerance=""/> </recipelines> </recipe> </recipes>

Born: 2025-01-29, Modified: 2025-01-29 17:09:31

Cone 10R Transparent Base

Total:100.00

Auto Unity Formula

Notes

*This glaze can be used in oxidation or reduction for a crystal clear. It works well in reduction on whiteware bodies like Plainsman P580 and P590 and is also good on all other high temperature stonewares (even iron reduction).

Add Zircopax (up to 15%) for white, and stains for colors as desired. Colors however will be more subdued than at lower temperatures and some, such as chrome-tin pinks, may not work at all.

Add 2-15% iron for a whole range of celadon, brown crystal, tenmoku, kaki, translucent brown and crystaline glazes. About 11% is good for a tenmoku. If the iron fluxes the glaze too much, remove the zinc.

This glaze has been tested in high temperature oxidation and produces the same glossy transparent. However, on stoneware bodies with coarser particle sizes the surface can be slightly dimpled. It does not seem to make a difference whether the zinc is removed or not.

Some stains that work very well at this tempature are mason stains no. 6242,6464,6305,6319,6364,6134, and 14k139. I found it was better to apply the stain over the glaze then under.

Pictures

Ravenscrag GR10 variations outside, G1947U inside

Left mug inside: G1947U clear
Left & right mugs outside: GR10-CW White
Right mug inside: GR10-A transparent (pure Ravenscrag Slip)
Clay body is H550.

H550 with RavenTalc base, G1947U Transparent

The G1947U (right) really enhances the speckle. The GR10-C (left) mutes it much more and adds color.

G1947U, G3910 on H443 at Cone 10R

The fritted version on the right is pickup up the iron color and has less micro-bubbles, thus is more transparent.

G1947U, G3910 on H550 at Cone 10R

G1947U is more opaque, likely because it is hosting more micro-bubbles.

G1947U on H570 an H550 - Cone 10R

On H450, P600 at cone 10 oxidation

On H450, P600 at cone 10 oxidation

G1947U using Grolleg Kaolin

P700 porcelain P5797. Left: EPK. Right: Grolleg Kaolin (produces bluish color).