A clear or pale glaze tuned so the glaze contracts more than the body on cooling, breaking into a fine network of cracks that reads as veining. Often rubbed with ink or tea to highlight the lines. Song-dynasty Ge ware, Korean buncheong, Western art-pottery clear-crackle.
Glaze formulated with high alkali (Na₂O, K₂O) — fluxes that drop melting point but raise coefficient of thermal expansion. Body / glaze CTE mismatch: glaze ~7–10 × 10⁻⁶/°C vs. typical stoneware body ~5–6. On cool-down the glaze tries to contract more than the body holds it; the surface releases the strain by fracturing in a network. Crack pattern is a function of glaze thickness, cool rate, and CTE delta. Deliberate crackle: lower the body CTE or raise the glaze CTE. Accidental crackle is the same phenomenon called crazing — a defect when the body is meant to hold liquid through the cracks. Stained crackle: rub India ink, ferrous sulfate, or strong tea into the cracks while still warm.
character — fine spider-web crack pattern over a clear / pale glaze, ink-darkened lines, archaic register.
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, 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, Lefteri, Forty, Sparke, ASM, GIA. Every voice: Voices.
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