An oxy-acetylene torch passed across the face of a granite slab — the differential thermal expansion of the quartz and feldspar crystals pops the surface into a coarse, slip-resistant texture. The classic finish on granite paving, building-base courses, exterior steps. Reads as a deep matte, deeply textured, almost geological surface.
Oxy-acetylene or oxy-propane flame at ~3000 °C passed across a wet stone surface. Quartz crystals (CTE 7 × 10⁻⁶/°C) and feldspar / mica (CTE 2–4 × 10⁻⁶/°C) expand at different rates; the differential exfoliates the surface in a 2–6 mm-deep coarse texture. Color reads slightly warmer / paler than polished (heat alters surface mineral chemistry, calcines fines). Slip-coefficient (BCRA / DIN 51097) goes from CL 0.3–0.5 polished to 0.7–0.9 flamed — the standard spec for outdoor steps and pool surrounds. Best on coarse-grained igneous stone (granite, basalt); won't work on fine-grained or calcareous (marble cracks; limestone calcines).
character — deep matte, coarse open-pore texture, paler than polished, geological-reading.
Marble Institute of America / Natural Stone Institute care-and-finish guides; ASTM C1242 dimension stone terminology.
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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