A blue-opal glaze where the color isn't from a colorant but from light scattered by tiny droplets of a separated phase suspended in the glass — physics, not pigment. Song-dynasty Jun-yao kilns (Henan, China, 11th-13th century) defined the look. Reads as moonlit sky, occasionally with copper-red flushes (Jun + copper trace = peacock or sang-de-boeuf bloom).
High-silica feldspar glaze fired to cone 9–11 in light reduction. Blue color is structural, not pigmented — phosphorus-rich glaze chemistry causes liquid-liquid phase separation on cool-down: nano-scale silicate-rich droplets (~50–250 nm) suspended in the glass scatter short-wavelength light (Mie / Tyndall scattering) and pass long-wavelength light, giving the opalescent blue. Add 0.5–2% copper oxide for the Jun-with-flush variant; reduction reduces Cu²⁺ → Cu⁰ giving sang-de-boeuf red blooms. Modern American Jun glazes (Pete Pinnell, Phil Rogers recipes) use phosphate flux additions to drive the phase separation. Hard to control reproducibly — the blue depth is a function of cooling rate.
character — structural opalescent blue, moonlit-glass register, occasionally copper-red bloomed.
Robin Hopper *The Ceramic Spectrum* (Krause, 2nd ed.); Daniel Rhodes *Clay and Glazes for the Potter*.
House vocabulary — terms ForMatter uses with intent.
Materials and processes for people who design and make things.
A local-first library of materials, processes, applications, and finishes — equal weight, citable everywhere, with cost-over-volume curves, trade-off profiles, equipment-tier filters, and second-life paths layered onto the data so a student can move from "what is this" toward "what's actually buildable here, now, by me." Part of the renato.design ecosystem — sibling of Plenum, Specimen, Ingenue, gesture, graf, and the Renato Rhino plug-ins. Form and matter, inseparable.
Half of teaching materials is teaching how the material is made into the thing. The standard subscription library was always light on that half. The wedge here isn't better samples or a prettier interface — it's treating Process as a peer entity, not a footnote.
Conway's Material World on raw materials, Lefteri's Making It on processes, Forty's Concrete and Culture, Sparke's Design in Context, Bürdek's Design: History, Theory and Practice of Product Design, Schröpfer's Material Design on materials in architecture, Winchester's The Perfectionists on tolerance, Minshall's Your Life Is Manufactured on the global supply chain, von Busch's Making Trouble on material activism, Were's How Materials Matter, Hegger / Drexler / Zeumer's Basics Materials, Untracht and McCreight on metalsmithing, USDA Forest Products Lab on woods, GIA on gemstones, Schott / CoorsTek / Toray / Owens Corning datasheets, MakeItFrom for verifiable property numbers, ASM Handbook, ISO standards. Museum holdings draw from the Met, MAD, V&A, Smithsonian American Art Museum, Newark Museum of Art, British Museum, Heard Museum, Smithsonian NMAI, Eiteljorg Museum, Philadelphia Museum of Art, Cranbrook Art Museum, and Grand Rapids Art Museum — collection-record permalinks only, designer overview pages and exhibition listings excluded. Voice blocks now ride on every entry kind — material, process, application, and finish — and include Ruskin on iron, Anni Albers on twining, Greg Lynn on the shred-and-teeth NURBS lineage, Pugin on the metal that won't be hammered, Barthes / Yanagi / Benjamin channeled within their philosophy; Sparke, Bürdek, Forty, Conway, Schröpfer, Minshall, von Busch, Lefteri, Pat Pruitt, Mary Lee Hu, Tom Joyce, Albert Paley, and the rest of the contemporary makers quoted verbatim with citation. All cited.
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