High Calcium Semimatte 1 (Mastering Glazes)
From page 86 of Mastering Glazes book
|
Code # G4615A |
| Materials | Amt |
|---|---|
| Ferro Frit 3195 | 20.000 |
| Wollastonite | 29.000 |
| Nepheline Syenite | 4.000 |
| EPK | 30.000 |
| Silica | 17.000 |
Total:100.00
Auto Unity Formula
|
Si:Al: 6.8:1 6.5 (Molar:6.6) 4.5 Cost 0.00 per kg |
Notes
This has 3.0 molar of SiO2 (vs 2.5 for G1214Z1). Ron039;s priority was likely to develop a better glass for hedging against leaching.
This thus requires slower cooling to get the best matte.
This low a lower COE than G1214Z1, so it may be less likely to craze.
Pictures
XML (to paste into Insight)
<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="High Calcium Semimatte 1 (Mastering Glazes)" keywords="From page 86 of Mastering Glazes book" id="283539" key="jpx1mHGm" date="2026-10-16" codenum="G4615A"> <recipelines> <recipeline material="Ferro Frit 3195" amount="20.000"/> <recipeline material="Wollastonite" amount="29.000"/> <recipeline material="Nepheline Syenite" amount="4.000"/> <recipeline material="EPK" amount="30.000"/> <recipeline material="Silica" amount="17.000"/> </recipelines> </recipe> </recipes>
Born: 2026-01-04, Modified: 2026-10-16 19:50:47
High Calcium Semimatte 2 (Mastering Glazes)
Base from Mastering Glazes book page 89
|
Code # G4615D |
| Materials | Amt |
|---|---|
| Ferro Frit 3195 | 23.000 |
| Wollastonite | 28.000 |
| Nepheline Syenite | 4.000 |
| EPK | 28.000 |
| Silica | 17.000 |
Total:100.00
Auto Unity Formula
|
Si:Al: 6.9:1 6.5 (Molar:6.6) 4.2 Cost 0.00 per kg |
Notes
This increases the B2O3 in version 1 to produce slightly better melting.
Pictures
XML (to paste into Insight)
<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="High Calcium Semimatte 2 (Mastering Glazes)" keywords="Base from Mastering Glazes book page 89" id="283538" key="yC7NZcJT" date="2026-10-16" codenum="G4615D"> <recipelines> <recipeline material="Ferro Frit 3195" amount="23.000"/> <recipeline material="Wollastonite" amount="28.000"/> <recipeline material="Nepheline Syenite" amount="4.000"/> <recipeline material="EPK" amount="28.000"/> <recipeline material="Silica" amount="17.000"/> </recipelines> </recipe> </recipes>
Born: 2026-01-04, Modified: 2026-10-16 19:50:08
Cone 6 Calcia Matte v2
|
Code # G1214Z1 |
Batch # -2 |
| Materials | Amt | |
|---|---|---|
| Wollastonite | 27.000 | 26.73% |
| Ferro Frit 3124 | 36.000 | 35.64% |
| EPK | 20.000 | 19.80% |
| Silica | 5.000 | 4.95% |
| Calcined Kaolin | 13.000 | 12.87% |
Total:101.00
Auto Unity Formula
|
Si:Al: 5.5:1 7.0 (Molar:7.1) 2.9 Cost 0.00 per kg |
Notes
This is an adjustment to the original G1214Z recipe. The chemistry of this is the same, but the 37 raw kaolin in the original has been split to a combination of raw:calcined kaolin to reduce drying shrinkage (preventing cracking as it dries and crawling during firing). If unavailable, you can make your own calcined kaolin by roasting the powder in a container in a bisque firing.
Like G1214Z, this achieves a mat surface by incorporating a very high percentage of CaO in the chemistry. While visually appealing surfaces can be achieved, especially with slower cooling, leach testing should be done if metal oxide pigments are being used.
For 3000 grams we use 2600 water to get 1.45 specific gravity and good flow properties (no Epsom salts should be needed to gel the slurry, it is naturally thixotropic).
Pictures
3 opacifiers on Coffee Clay, M390 in G1214Z
G1214Z2 on M340, M390 at cone 6
G1214Z at cone 6 with 10% Zircopax and 5% tin oxide
The body is Plainsman M390. The firing schedule is Plainsman PLC6DS. The tin is on the right.
Alternate Code Number:GS6-B
XML (to paste into Insight)
<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Cone 6 Calcia Matte v2" id="156545" key="hv9cgaKB" date="2026-10-16" codenum="G1214Z1" picturebasename=""> <recipelines> <recipeline material="Wollastonite" amount="27.000" tolerance=""/> <recipeline material="Ferro Frit 3124" amount="36.000" tolerance=""/> <recipeline material="EPK" amount="20.000" tolerance=""/> <recipeline material="Silica" amount="5.000" tolerance=""/> <recipeline material="Calcined Kaolin" amount="13.000" tolerance=""/> </recipelines> </recipe> </recipes>
Born: 1998-04-21, Modified: 2026-10-16 19:47:35
