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)

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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 temp. 
This time I’m labeling the X-axis with SiO2:Al2O3 instead of SiO2.  Using the silica:alumina ratio as the axis seems clearer to me.  The Si:Al ratios are 7, 8, 9, 10, and 11.

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Fine-tuning a Recipe

Cone 10 Reduction:

Cone 10 Oxidation:

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:

#glaze #glazes #glazerecipes#glazetest #ceramics #pottery#ceramicglazes #glazechemistry#glazechem #glazecalc #glazy

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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. All tests fired to Orton cone 10 in reduction atmosphere starting at cone 010.

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“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, and he has allowed me to publish his recipes on Glazy.  Thanks so much, Harlan!

Download “My Work, My Way”:

Glazy Collection of Harlan House’s Recipes:

Harlan’s Videos:

Harlan on Facebook:

#glaze #glazes #glazerecipes#glazetest #ceramics #pottery#ceramicglazes #glazechemistry#glazechem #glazy #harlanhouse

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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 color differences between light sources are more prominent in person.  All recipes and photos available on

@ceramicmaterialsworkshop just posted some excellent tests by @laura_rainbowyoda showing the influence of different Alkaline Earth Fluxes on the color and quality of glazes with Rare Earth additions.

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Glazy.org是一个完全免费的陶瓷配方资料馆, 现在网站支持多种语言啦,包括中文!在这里你可以查找你想尝试的釉料配方,记录你的釉料实验过程和结果,上传釉料试片照片,可以看到化学成分分析,可以计算原料配比,等等。Glazy资料馆的完善度依赖于陶艺家们的分享。Glazy是Derek Au在2015年创建的。截至2019年3月,Glazy已经含有超过8000个坯体泥料配方和釉料配方。这些都是来自全球各个国家的陶艺家们试验研究成果,由他们自己录入和分享的。Glazy 也诚恳地接受艺术家们对网站的反馈,会不断地维护,成长和完善,并且响应他们对网站的功能需求。  #陶艺#陶藝#陶艺家#陶瓷#釉#釉料#釉薬#试釉#景德镇#试片#Glazyorg

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Multilingual Glazy

Huge new feature:  Internationalization!

Glazy now in Español, Français, Nederlands, Hrvatski, 中文.  And more on the way!

One of the most inspiring aspects of Glazy is that it connects ceramicists from all over the world through the universal language of ceramics and chemistry.  And now that Glazy’s user interface and metadata categories are translated into multiple languages, it will be even easier to share our knowledge.

Special thanks to these amazing ceramicists who crowd-sourced the translations:

Alisa Liskin Clausen, Monique Duclos, Ana Felipe, Clara Giorello, Louis Katz, Art Kha, Čazo Čazim Mehmeti, Huang Nuokan, Jean-Pierre Prieto, Stijn Vanacker, and Trees Wijnands.
#glaze #glazes #glazerecipes#glazetest #ceramics #pottery#ceramicglazes #glazechemistry#glazy #internationalization#worldpeace

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Quickly Wet-mixing Multiple Additive Tests

@ceramicmaterialsworkshop‘s “Understanding Glazes” course uses the following method to quickly mix variations of a glaze using one batch of base glaze and nine different types of additives (e.g. cobalt, copper, iron, stains) in two different amounts each.  It’s a really simple way to learn how different additives like colorants and opacifiers affect a glaze.