A high-iron glaze that fires deep glossy black, breaking to rust-brown where the glaze runs thin over edges or relief. Tea bowls from the Jian kilns (Fujian, China, 12th-13th century) defined the look; Japanese tea masters imported them through the temple at Tianmu (whence 'tenmoku') and made them the most prized chawan. Reads as deep, oily, ancient.
Feldspathic glaze with 8–14% iron oxide as colorant, fired to cone 9–11 (~1280–1300 °C) in oxidation or light reduction. The high iron saturates beyond solution limit; on cool-down iron crystals precipitate at the surface giving the characteristic 'oily' reflection. Glaze surface fluid at peak temperature, runs to thin on edges where Fe³⁺ is preserved as rust-brown bare surface. Variants: oilspot tenmoku (iron crystals visible as silver-gray spots), hare's-fur tenmoku (iron streaks running with the glaze flow), partridge-feather tenmoku (mottled spots) — all the same chemistry, different cooling regimes.
character — deep oily black with rust-brown rim breaks, fluid running glaze, ancient 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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