Products
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The Glaze Files - #10 Temperature
CourseHow to fire below cone 10. Boron is the key — not a flux but a low-melting glass former — and the Katz boron map tells you how much you need at any cone. Plus frits, the lost Gerstley borate, and Bristol zinc-calcium reactions.
$60
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The Glaze Files - #9 Durability
CourseWhy "food-safe" and "durable" aren't the same thing. Durability comes down to the flux ratio: 0.3:0.7 wins at every temperature, acids and dishwasher soaps attack glass differently, and boron can never rescue a bad flux ratio. Full stop.
$60
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The Glaze Files - #8 Calculations
CourseTheory becomes practice: calculate the Unity Molecular Formula by hand and with software, then use it to manipulate real recipes — substituting materials, changing temperature, and moving glazes around Stull's map. Plus why "glaze limits" are garbage
$60
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The Glaze Files - #7: Seger and Stull
CourseThe theoretical heart of the course: why glazes melt only in the last 100°C, why we fire to a chemical reaction not a temperature, and how Seger's Unity Molecular Formula and Stull's map predict whether any glaze will be glossy, matte, or underfired.
$60
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The Glaze Files - #6 Alkaline Earths
CourseThe second flux type, and arguably the more important: 70% of a glaze's flux, driving color, texture, and durability. Profiles calcium, magnesium, strontium, barium, and zinc, busts the Whiting-pinhole myth, and gives barium's toxicity honest context
$40
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The Glaze Files - #5 Alkali Metals
CourseFluxes bring glass formers down to kiln range; every glaze needs two. This covers the first: alkali metals. How fluxing works, why lithium/sodium/potassium are interchangeable, why feldspars are the default, and why soluble carbonates cause trouble.
$40