Category: Ceramics

  • Six McKnight Artists

    Exhibition Website: From January to March of 2018 I had the opportunity to work at the Northern Clay Center as a McKnight Visiting Artist as well as participate with some of my pottery heroes in the wonderfully-curated “Expatriate Ceramics” exhibition. NCC is a well-oiled machine with an amazing staff. The care and attention they bring […]

  • Paintings of the Traditional Porcelain Process

    “Export” Art During the 18th Century, Guangdong province was the hub for trade with the West. The dialogue between Western merchants and artists with both painters and porcelain producers resulted in a unique blend of Chinese and Western styles. This blend was reflected in the painting styles for both Export Paintings as well as Export […]

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  • USG Plaster Slide Rule

    Plaster Calculator Update:  1) Specify units in inches or centimeters, 2) Added @nbivins formula (via @jeffcampana‘s). More ideas for improvements?  Let me know in the comments! (link in bio) Pictured here:  The original “gypsum cement & plaster VOLUME and MIX calculator” from USG with awesome 80’s graphic design. (Courtesy @earlyamericanrobotpottery)

  • Plaster Calculator

    Calculate the amount of water and plaster you will need for various solid forms. Bookmark this link on your phone’s browser for easy access! The code is open source and available on Github: Inspired by Keith Simpson’s (@earlyamericanrobotpottery) plaster handout and the USG plaster calculator. The calculations are from USG (, Keith Simpson […]

  • Koryo Celadon with Bone Ash and Manganese

    Testing the effects of Bone Ash and Manganese Dioxide additions to a celadon base. Koryo Celadon #3 from Nigel Wood’s “Chinese Glazes”, “Recipe for Table 8b – Koryo celadons”. Originally tested by @macmakesflamingos. Forgot to mention: Fired to cone 10 in reduction. Grolleg porcelain body. 

  • Copper Red Biaxial

    Attempting a Copper Red with “normal” flux ratio of R2O:RO 0.3:0.7. (Most formulas I’ve seen have higher R2O levels of 0.4:0.6 or more.) Fixed 0.15 B2O, 0.02 SnO2, 0.01 CuO (1% Tin Oxide and 0.35% Copper Carbonate). Fired together to Orton Cone 10 in reduction starting at cone 010 with 30-minute oxidation hold at peak […]

  • Xuande copper red

    First attempt at a Xuande copper red based on analyses from Nigel Wood’s “Chinese Glazes”, “Copper in Chinese Glazes”, Table 71 “Analyses of Xuande and Yongle Jingdezhen porcelain glazes”, p 179.  Applied to Grolleg-based porcelain body, fired to Orton Cone 10 in reduction atmosphere.

  • Reitz Purple Base Triaxial

    A triaxial blend using Reitz Purple base with additions of Red Iron Oxide and Light Rutile.  Fired to Orton Cone 10 in both oxidation and reduction.  The most interesting tests are the intermediary glaze containing both iron and rutile.

  • Fine-tuning a Recipe

    Creating a small Si:Al biaxial test to “fine-tune” a recipe, in this case Reitz Purple.Using the Glazy calculator, four “corner” recipes were created.  Volumetric blending using a syringe was used to create the intermediary glazes.  Tests fired to Orton Cone 10 in both oxidation and reduction.  For more information, see: Cone 10 Reduction: Cone 10 Oxidation: #glaze […]

  • “Dry Glazes” by Jeremy Jernegan, 2009

    I’ve just added some glaze tests from “Dry Glazes” by Jeremy Jernegan, 2009. Some interesting decorative textures and effects, although a number of the glazes were overfired at cone 10.  I’ve added even the “bad” tests, though, so that others can double-check their own tests or even avoid those recipes entirely.

  • Rapid Glaze Calculator

    Rapid glaze calculator designed by Colin Pearson and Dennis Healing. Published in “Glazes for the Craft Potter” by Harry Fraser, 1998.

  • Harlan House Glaze Tests

    Absolutely beautiful results from tests of Harlan House’s recipes. Pictured here are tests of Harlan’s Jun, March Crackle, HH Shino and HH Celadon.  Both March Crackle and HH Celadon have lovely satin surfaces, while the Jun is one of the best I’ve seen, falling neatly in the same high-silica “Jun” region as the ancient Chinese originals. […]

  • “My Work, My Way” by Harlan House

    Newly-published book and recipes from Harlan House! Earlier this year, the pioneering ceramicist Harlan House published “My Work, My Way: Fifty Years in the Studio”. Part autobiography, part studio guide, Harlan’s lovely stories are interspersed with technical tips, special techniques, and recipes he developed over decades.  Harlan is generously offering his book as a free download, […]

  • Cone 6 Clear with Various Mason Stains

    As Glazy grows, it becomes a “Pantone” reference library of glaze color. Various Mason Stains in 8%, 4%, and 2% additions to a Cone 6 base, Celadon Clear, on Standard #551 porcelain and fired in Oxidation at Orton Cone 6. All recipes and photos available on Glazy:

  • Rare Earth Glazes in Different Lighting

    Some of your requested my previous tests of Erbium Oxide, Neodymium Oxide, and Praseodymium Oxide in Oxidation at Orton Cone 6. Here are tests using my Cone 6 base, Celadon Clear, on Standard #551 porcelain.  Two sets of photos, one in natural window light and the other in fluorescent light with appropriate adjustments to white balance.  The […]

  • Clara Giorello

    Glazy is a collaboration of ceramicists from around the world.  One of Glazy’s most active users, Clara Giorello, is from Buenos Aires.  Clara has added more than 350 recipes with photos and copious notes, including firing schedules and suitable material substitutions for South American potters.  Thanks so much, Clara!  @claragiorello

  • Various Copper Red Tests

    Various new tests of Copper Red glazes and variations now available on All glazes fired to orton cone 10 in reduction starting at cone 010 with oxidation hold at peak temp. Special thanks to @pete.pinnellfor his Copper Red firing tips (found in the Clayart archives).

  • Rare Earth Oxides Glaze Line Blends

    Line blends of Erbium Oxide, Neodymium Oxide, and Praseodymium Oxide in a clear glaze base (Mahavir Clear) fired to Orton cone 10 in both oxidation and reduction atmospheres. All recipes and photos available on

  • Glazy in Russian!

    Really excited to collaborate with @ovo_ceramics, who not only translated Glazy into Russian but also shared Glazy with his followers!  большое спасибо!