Heat steel in air to 300 °C and the surface grows a thin oxide that reads peacock blue. A traditional gunsmith finish, the blued screws on a watch movement, knife maker's bolster decoration. The color is the oxide — clean it off, you remove the color.
Thin-film interference colors from controlled oxidation of carbon / tool steel in air. Color sequence by approximate temperature: pale straw 220 °C, dark straw 250 °C, brown-purple 270 °C, peacock blue 290 °C, dark blue 310 °C, gray 330 °C+. Layer is ~50–200 nm of magnetite (Fe₃O₄). Doubles as low-temperature temper indicator on tool steel. Soft, easily polished off; coat with thin oil or wax to preserve.
character — deep blue with a faint metallic sheen, fragile, traditionally hand-applied, wears naturally.
Hughes & Rowe The Colouring, Bronzing and Patination of Metals (Crafts Council, 1991, Watson-Guptill ed. 1995); American Institute for Conservation patina-conservation guidelines.
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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