Polish without an abrasive — submerge the part in an acid bath, run current through it, and the high points dissolve faster than the low points. Surface emerges smoother, brighter, and microscopically deburred. Standard for medical implants, food-grade tanks, semiconductor chambers.
Anodic electrochemical dissolution in a phosphoric/sulfuric acid mix at controlled current density (~10–20 A/dm²) and temperature (50–70 °C). Removes ~10–25 µm of surface material; preferentially attacks asperities, leaves valleys. Typical Ra reduction ~50% of starting value. Passivates stainless simultaneously (chrome-rich oxide layer thickens), so often spec'd for 316L medical / pharma where corrosion resistance and cleanability matter as much as cosmetic shine.
character — mirror-bright with no directional grain, slightly soft / wet read, sterile.
ASM Handbook Vol. 5 Surface Engineering; manufacturer abrasives literature (3M, Norton, Mirka).
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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