Category: Glazes

  • Lasse Östman Golden Glaze

    Lasse Östman generously shared his deep knowledge of glazes on his website and social media.  The Glazy community has been working to re-create Lasse’s glazes, and two recent results from @trees_wijnands and @xavierescala are just too wonderful not to post.  It’s amazing to see people around the world sharing their knowledge like this!

  • Moon pebbles?

    Just realized I hadn’t finished editing tests from a couple years ago.  Here’s a line blend of gloop: Left side has +5% Mason 6097 stain, while the right has +5% 1000 mesh silicon carbide (SiC).  At around 4% it becomes a dimpled, smooth, stone-like surface that’s great to the touch.

  • Marbling Gloop

    Some of you asked about how I made those marbled gloop tiles a couple years ago.

  • Let your customers know your ceramics are lead-free.

    This holiday season, let your customers know your ceramics are lead-free. Recently the NYC Health Department issued a warning about lead in “traditional ceramic ware” after a number of people reported lead poisoning.  As we know, there are no “safe” levels of lead exposure, so it’s good to see a health department doing its job.  Unfortunately, it’s […]

  • Two Years of Tests

    Time to leave the residency, and there’s no room in the Uhaul. Sad to say goodbye.  But these tests live on in Glazy, backed up and safe.  Much like my book and music collections, my glaze collection is now virtual. Ceramics is in some ways inherently wasteful.  But Art is one of the things that makes us human, […]

  • The Color of Celadon

    With all its variations, what does the term “Celadon” even mean? There are various theories as to why Westerners started using the term “Celadon”.  Regardless, “Celadon” refers to a category of Chinese ceramics known as 青瓷 (qing ci).  瓷 is porcelain while the 青 (qing) in 青瓷 signifies a color (or range of colors). But exactly which […]

  • The Colors of Celadon

    Just a few examples of celadons, there are more like Plum Celadon (梅子青) not to mention Jun and Guan.  Color and surface can vary within each type, and even between time periods.  A contemporary Duck Egg Celadon that adds a small amount of cobalt in addition to iron for extra color is quite different from the Yuan […]

  • Fake Traditional Chinese Materials Blends

    Using chemical analyses and US materials, I recreated traditional Chinese materials like porcelain stone, glaze stone, and glaze ash.  Limiting myself to these “fake” materials, I blended them to create porcelain bodies and glazes. Here are two line blends of fake Sanbao Porcelain Stone and fake Yaoli Glaze Stone blended with fake Glaze Ash.  While both of […]

  • Iron Tianmu Glaze

    This glaze was inspired by analyses of Song Dynasty dark iron glazes in Nigel Wood’s “Chinese Glazes”. I find this glaze superior to typical Tenmoku glazes like Leach Tenmoku due in part to the inclusion of magnesium. The minor additions of titania and manganese add to the depth. Rather than a slightly translucent dark brown […]

  • Visualizing Glaze Types

    These heatmaps show concentrations of public glaze recipes in Glazy for various glaze types.  Some types, like Shino, stand out, but maps for types like Celadon and even Tenmoku resemble that of Clear glazes.  Indeed, many Celadon and Tenmoku recipes are simply clear glaze bases plus Iron.  The map for the Matte type is predictably shifted towards the […]

  • US Pigment Stains in Porcelain Clay Body

    US Pigment Stains in Porcelain Clay Body Each of these tests was mixed with 100g porcelain clay body in amounts of +2%, +4%, +8%. The +8% was also mixed with black stain (Mason 6600, mixed about 25% black and 75% color).

  • Recreating Ancient Glazes

    Recreating Ancient Glazes using Glazy’s “Target & Solve” feature with analyses from Nigel Wood’s “Chinese Glazes”. In an earlier post I showed how you can quickly make a recipe from an analysis of an ancient glaze.  Here are four examples of recipes I tested using this technique. 1.  #121102 Koryo celadon glaze 3.  This came out BEAUTIFUL on stoneware […]

  • Basalt Glazes

    I’ve just published 20 basic oxidation cone 6 basalt glazes which you can use as a guide for more interesting variations.  (Link to recipes in bio.) For some inspiration, see Matt Fiske’s (@bluepotter) beautiful work with basalt on his website,

  • Visualizing Blend Types

    Tests using traditional line, triaxial, and biaxial blends can teach us a lot about ceramic chemistry.  But sometimes they feel limiting.  What other possibilities are there?  Arranging a series of line blends into a “complete graph” might be illuminating.  And instead of a flat biaxial, what about a three-dimensional pyramid/tetrahedron?  What if blends went 3d? I’d love to hear the #glazenerd army’s […]

  • SiC Additions to Clay Bodies

    A simple blend test adding Silicon Carbide (SiC) to a clay body. Wanted to see if I could induce reduction effects in an oxidized electric kiln environment.

  • Val Cushing’s Generous Legacy

    A celebration of Val Cushing’s generous legacy via @the_grinding_room Our inheritance of Cushing’s ceramic recipes has been painstakingly tested and recorded by @earlyamericanrobotpottery, @ray_ceramics_ and @brookecashionof the @the_grinding_room at Alfred University.  Each of V.C.’s recipes has been fired in both oxidation and reduction atmospheres and then professionally photographed and edited.  It’s wonderful to not only have these recipes and photos published on Glazy, but […]

  • Oxidation Bristol SiC Celadon

    For an upcoming @redlodgeclaycenter group exhibition, I wanted to try to make my “Painted” series of high-fire reduction celadon work in mid-fire oxidation.  This locally-reduced Silicon Carbide (SiC) Bristol Celadon glaze isn’t perfect.  Some have slight areas of carbon trapping on the interiors, and I didn’t have time to completely resolve the bubbles.  But I’m happy to have gotten some […]

  • Red Lodge Glazes

    The amazing @redlodgeclaycenter has generously allowed me to share their studio glazes on Glazy. Studio glazes often reflect the history of a studio.  They are brought in by a succession of studio technicians from their schools or places of previous employment, and the recipes go through a process of “natural selection”. Those that are unreliable are gradually […]

  • Vince Pitelka Underglaze

    For years I relied on the internet to find information about ceramics.  One of the most useful and reliable sources both then and now is Vince Pitelka’s website.  There he shares his knowledge on all aspects of the studio, from making your own tools to loading & firing kilns. (Although I have yet to try his Fabulous […]

  • Visualizing composition

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