A thin chromium layer electroplated over a copper-and-nickel-plated substrate. Reads bright, blue-cool, mirror-bright. Bumpers on classic cars, bathroom fixtures, the bezel on a kitchen mixer. Hard-wearing while the surface is intact, but a single chip lets corrosion crawl underneath.
Decorative chrome stack: copper strike (~10 µm, levels base) → bright nickel (~15–25 µm, the actual reflector) → chromium top coat (~0.25–1 µm, the protective tint). Modern trivalent chrome chemistry (Cr³⁺) replaces older hexavalent (Cr⁶⁺) in most regulated jurisdictions for environmental reasons. Hardness ~800–1000 HV. Corrosion resistance depends entirely on the nickel layer's continuity; pinholes corrode bimetal-fast. Hard-chrome plating (engineering chrome) is a different process — thicker, no copper / nickel underlayer, used for piston rods and hydraulic shafts.
character — blue-cool mirror, slick, the brightest of the practical plate finishes.
The addition of a chromed surface to steel in small consumer goods also became a feature of the 1930s. It served as a means of preventing steel from rusting and as a means of turning mass-produced goods into decorative items.
Editorial pass 2026-04-28; ASTM B456.
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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