Glaze type · Base glazes & colours
Clear
Across 1,021 published recipes: mostly cone 6 and cone 10, fired in oxidation and reduction; Glossy, transparent.
Cones
Atmosphere
oxidation 69% · reduction 24% · neutral 6% · salt & soda 1%
Surface
Glossy 72% · Semi-glossy 12% · Satin matte 7% · Satin 6% · Semi-matte 4%
Transparency
transparent 69% · translucent 24% · semi-opaque 6% · opaque 2%
Materials that define it
Share of recipes containing each material, and the typical amount when present. Materials link to their reference pages.
| Material | In recipes | Typical | Half of recipes |
|---|---|---|---|
| Silica | 84% | 20% | 13.12–28.17% |
| EPK | 47% | 12.5% | 8–20% |
| Whiting | 46% | 13% | 7.1–18.18% |
| Kaolin | 29% | 12.5% | 8.35–18.15% |
| Nepheline syenite | 27% | 24% | 16.84–38% |
| Gerstley borate | 22% | 18% | 10–30% |
| Wollastonite | 22% | 14% | 6.95–20% |
| Bentonite | 21% | 2% | 1.9–2% |
| Ferro frit 3134 | 21% | 22.25% | 17.04–32.25% |
| Custer feldspar | 19% | 31% | 20–42.19% |
| Zinc oxide | 18% | 5.11% | 3–9.75% |
| Dolomite | 15% | 9% | 5.1–15% |
| Talc | 13% | 6.44% | 3–10% |
| Potash feldspar | 13% | 28.7% | 20–40% |
Typical fired chemistry
Median oxide analysis (weight %) across the recipes that report one, with the interquartile range. Silica and alumina set the melt; the fluxes and colorants make the family.
| Oxide | Median | Half of recipes |
|---|---|---|
| SiO2 | 54.96% | 49.77–59.83% |
| Al2O3 | 11.49% | 9.73–13.13% |
| B2O3 | 5.63% | 3.72–10.52% |
| Na2O | 3.08% | 1.89–4.49% |
| K2O | 1.93% | 0.99–3.13% |
| CaO | 9.64% | 7.18–11.73% |
| MgO | 0.47% | 0.05–1.63% |
Related types
Questions
- What is a Clear glaze?
- In 1,021 published recipes, Clear glazes are mostly fired to cone 6 and cone 10 in oxidation and reduction, with a Glossy, transparent result. The defining materials are Silica, EPK, Whiting, Kaolin, Nepheline syenite.
- What cone is Clear fired to?
- The most common cones in published recipes are cone 6 and cone 10; the full distribution is on this page. Atmosphere matters as much as cone for this family: oxidation and reduction.
- What is the typical chemistry of a Clear glaze?
- Median fired analysis: SiO2 54.96%, Al2O3 11.49%, B2O3 5.63%, Na2O 3.08%, K2O 1.93%, CaO 9.64%. Treat these as the centre of a range, not a target — the same family spans different fluxes and cones.
Sources. Every figure is a statistic computed by Claybench over 10,859 glaze recipes compiled from publicly shared community recipe collections (snapshot 2026-02-27); no recipe is reproduced. Colour-chemistry notes are paraphrased from Linda Arbuckle's Ceramic Materials handout.
Colorant and flux notes touch on materials with handling hazards (barium, cobalt, chrome, manganese, lead in historic recipes). Read each material's page and its supplier SDS before mixing; test any food surface.
Claybench checks a glaze against your clay body and cone before it lands on a plan
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