Steel Wool

identity

one-line: A loose mass of extremely fine, springy, sharp-edged low-carbon steel fibers — shaved off wire like continuous metal curls — used by hand, with no backing and no binder, to scuff, clean, polish and deglaze, and (deliberately or not) to stain tannin-rich wood black through its own rust chemistry.

name: Steel wool (US/general) / wire wool (UK/Commonwealth) / iron wool (older usage). Keep three kinds apart: clean finishing-grade steel wool; soap-impregnated household pads (Brillo, S.O.S. type), which carry added soap and corrosion-inhibitor chemistry and are not interchangeable with clean finishing-grade wool; and non-ferrous wools (bronze, brass, stainless, aluminum), which are alternative variants, not brand forms of ordinary steel wool [A2; A6].

family / category: Abrading tools by function, but structurally unlike every grit-side member built so far. It is not COATED (no backing the fiber is glued to), not BONDED (no fired or cured mass), and not the non-woven form: the Non-Woven Abrasive Pad suspends mineral abrasive through a nylon web, while steel wool has no separate mineral abrasive. The fiber itself is the abrasive — its own sharpness and fineness does the cutting. Placed in the tree as the non-woven pad's functional predecessor and continuing alternative.

✦ how NOT to use it

not-for:

• Leveling or truing a surface — no rigid backing, no fixed grit pattern; it conditions and burnishes [B2].
• Any use under or near a waterborne (water-based) finish — the tool's most consequential "not-for." General Finishes directly warns that embedded steel fragments can rust under water-based finishes [D6] [manual, relayed].
• Stock removal where sandpaper belongs [B2].
• Old or unknown paint removal as a casual job (see the coating gate).

dangerous (injures the user, or the property):

• Hands (Fix 7). Manufacturer guidance says to cut rather than tear steel wool and to wear gloves, because coarse fibers can cause severe cuts (PPG catalog, per the reviewer) [manual, relayed]. Fine fibers can also embed in skin, hard to see and remove (single, lower-confidence source) [C9].
• Eyes and breathing (Fix 7). SDS material identifies eye and respiratory irritation from fibers and dust (PPG Steel Wool All Grades SDS, per the reviewer) [manual, relayed]. Wear eye protection when particles may fly; use ventilation and respiratory controls appropriate to the dust generated and to any contaminated coating. The workpiece coating may be more hazardous than the wool. Heating or burning steel wool can add inhalation hazards.
• ★ Fire from ignition. Fine steel wool ignites far more easily than solid steel. Touching a 9-volt battery across two fibers completes a circuit, and resistive heating is enough to ignite them almost instantly; exposed 9-volt terminals can short through steel wool and generate enough heat to start a fire (Oklahoma City Fire Department, per the reviewer) [manual, relayed]. Do not store steel wool loose near 9-volt batteries [C1; C2].
• ★ Self-heating of wool saturated with oxidizing oil products (corrected, Fix 2). Steel wool saturated with a drying oil or an oil-based stain or finish may self-heat as the product oxidizes. Authoritative sources support this for rags and applicators soaked with oil-based finishes, stains and drying oils: the NTSB (oil-based wood-finishing product self-heating), the Cleveland Heights Fire Department (oil-soaked applicator disposal) and General Finishes (oil-based stain waste warning), as the reviewer describes them [manual, relayed]. Follow that product's label and local disposal requirements; never leave saturated material crumpled or piled. Disposal is product-specific; this entry does not prescribe one universal method (the original's "sealed, water-filled metal container or spread flat outdoors" is withdrawn as a universal rule; use whatever the product label and local fire/waste rules direct). These sources do not support claims that plain steel wool, residual manufacturing oil, arbitrary wax residue, dampness or humidity alone will spontaneously ignite; those claims, including the forum "fire marshal" quotation, are removed.
• Hydrogen from the ebonizing reaction (Fix 3). The iron–acetic-acid reaction evolves hydrogen, a flammable gas, and a tightly sealed, actively reacting container can build pressure. Ventilation, no ignition sources, no tight sealing, safe labelling and storage (see the revival gate) [manual, relayed].
• Electrically conductive — a named OSHA hazard. OSHA 29 CFR 1910.333(c)(9) names steel wool among conductive cleaning materials that may not be used near energized parts unless procedures prevent electrical contact [C8] [manual, relayed] (the OSHA text could not be re-read in this pass).
• Steel-wool photography done indoors or near combustibles: burns near 1,300 F / 700 C and has caused real fires; outdoor-only, protective-gear guidance is consistent [C3].
• Hazardous coatings. Disturbing old or unknown paint can release lead dust or fumes (see the coating gate).
• Honesty flag — power tools. Steel wool attachments for drills and rotary tools are sold, but no source specifically warning against chucking steel wool into a power tool was found. The hazard of fine wire wheels (fragments becoming needle-like projectiles) is documented [C10] and is carried as a reasoned-by-analogy caution, not a sourced fact about steel wool.

damaging (ruins the tool, the work, or the finish):

• ★ Under a waterborne finish, or on tannin-rich wood with no finish. Fine steel fragments left in the grain rust under a water-based finish, producing black or green speck staining; General Finishes recommends a vacuum, compressed air or an oil-free tack cloth instead [D6] [manual, relayed]. Iron from steel wool also reacts with the tannins in oak and similar species to form black iron-tannate staining even with no finish [D7; D8].
• Wrong finish system or cure state. Using steel wool where the finish maker does not permit it, or before cure, can cause adhesion, contamination or scratch-pattern problems.
• Too coarse a grade: grade #2 "is just way too coarse for any finish work" and leaves visible scratches [B5].
• Incomplete cleanup leaves shed fibers to rust under the next coat [D6].

beginner-trap:

• "Finer must be safer": even 0000 will scratch some finishes or soft substrates; the right grade is relative to the finish [B5].
• Skipping the lubricant: used dry or across the grain it scratches and streaks more readily [B4].
• Storing loose with batteries, or discarding product-soaked wool into a bin or rag pile without following the product's label [C1].

lineage-misuse:

• Treating steel wool as a rust-free non-woven pad, or using synthetic-pad wet-use habits without accounting for steel wool's rust and staining. The synthetic pad avoids those liabilities; steel wool does not share that property [B7; sibling entry].
• Treating bronze or brass wool as interchangeable with steel wool, or soap-impregnated household pads as interchangeable with clean finishing-grade wool.
• Expecting it to level a surface the way a coated abrasive does [B2].

correct use

what it's genuinely good at. Rubbing a sufficiently cured, compatible film finish down to an even satin sheen (classically 0000 with paste wax as a lubricant, with the grain) [B3; B4]; stripping old paste wax; cleaning and polishing bare or plated metal hardware; a last hand pass where no machine abrader can reach cleanly [B1; B2].

Finish compatibility gate (Fix 6). Use steel wool for deglossing, scuffing between coats or rubout only where the specific finish manufacturer permits steel wool, typically on sufficiently cured, compatible oil-based film finishes. Follow that system's grade, cure-time, cleanup and recoating instructions. Compatibility depends on the finish system, its cure state and the intercoat scratch it requires; the original's blanket match to "lacquer, varnish, polyurethane" is withdrawn. Waterborne finishes are a categorical exclusion (below).

Coating gate for removal work (Fix 1). The original listed "general rust and light paint removal at coarser grades." Replace with: removing a known, non-hazardous coating in accordance with the coating manufacturer's instructions. Treat old or unknown paint as potentially hazardous. PPG's catalog warns that scraping, sanding or removing old paint may release toxic lead dust or fumes and specifies exposure controls [manual, relayed] [PPG catalog]. Before disturbing old or unknown paint: assess for lead and other hazards, use the applicable containment, PPE and HEPA-cleanup requirements, and follow current local rules. "Light" removal does not make a hazardous coating benign, and old-paint removal is not a casual beginner task.

how to use it well (short version — the workbench holds the deep operation). Match the grade to the job: finer grades are gentler. Use a lubricant (paste wax, mineral spirits or soapy water) for a rubout rather than working dry, with the grain on wood. Cut with shears; do not tear by hand. Vacuum and tack with an oil-free cloth afterward to remove shed metal fibers before any further finishing [B4; D6].

✦ matching

Matching prerequisites: a known coating and substrate for any stripping or abrasion, and the finish manufacturer's permission for any between-coat or rubout use.

does: deglossing/scuffing a compatible, cured finish where its maker permits; rubbing a compatible film finish to satin; stripping paste wax; polishing and cleaning metal hardware; removing a known, non-hazardous coating or light rust per the coating maker's instructions; and, as a separate chemical-preparation use with its own controls, producing an ebonizing solution when reacted with vinegar [B1-B4; D9].

suits: the final rubout of a compatible oil-based film finish (where the maker permits steel wool); wax stripping before refinishing; hardware cleanup; and ebonizing solution for oak, walnut and other tannin-rich woods under the controls below [B3; B4; D9].

kit-fit: pairs with paste wax and mineral spirits. Substituted by the Non-Woven Abrasive Pad for most finishing and conditioning jobs, especially where rust risk matters, with 3M grading pads against steel-wool equivalents [B7]. Substituted by bronze or brass wool wherever ferrous contamination or magnetic interference is unacceptable [A6; A7]. It does not substitute for sandpaper where leveling or stock removal is required.

access: low mechanical complexity, but it still requires cut, particle, coating, fire and electrical controls. The original's "genuinely beginner-safe" is withdrawn. See hand, eye and dust controls below. Gun cleaning needs grade and lubrication judgment; disposal and storage of any product-soaked wool is not optional knowledge; use near power tools or live electrical work is out of beginner territory.

revival (ebonizing — a chemical preparation, not just a clever use). A maker who owns steel wool already has the raw ingredient for a documented technique: reacting steel wool with vinegar to make an iron acetate ebonizing solution for tannin-rich woods [D9; D10; D11]. Controls (Fix 3, per the reviewer): the iron–acetic-acid reaction evolves hydrogen. Work with ventilation, away from flames and sparks, and do not tightly seal an actively reacting container. Use a measured, sourced recipe (this entry does not supply one) and label and store the solution safely. [manual, relayed] (Journal of Wood Science paper, as the reviewer describes it).

anatomy

• Fiber — low-carbon steel wire, cold-drawn, shaved into a continuous ribbon with a sharp, roughly pyramidal cross-section by a toothed blade; the blade needs resharpening roughly every three hours in production, and oil is applied during cutting to reduce friction and fire risk [H1].
• Pad / hank — loose, wool-like mass with no backing and no binder; bulk hank, pre-cut pads, twisted rope or needled mats [H1; A1].
• Grade — set by the cutting blade's ridge geometry and the machine's feed speed, not by an applied grit [H1]. The 0000-to-4 ladder is a manufacturer convention, not a governing standard.
• Alloy — most steel wool is low-carbon steel; the same process runs on bronze, brass, aluminum and stainless wire [A6; H1].
• Byproduct — fine swarf is sold on for brake-pad and concrete fillers [H1].

variations (living)

• Bulk hank / pre-cut pad.
• Soap-impregnated pad (Brillo, S.O.S.) — steel wool plus a soap base, surfactants and a sodium nitrite corrosion inhibitor to slow its own rusting [F1; F2]. Not interchangeable with clean finishing-grade wool.
• Oil-impregnated / gun-cleaning pad — 0000 steel wool pre-soaked in oil for firearm metal; forum consensus is not to use it dry on bluing, and to avoid stainless wool on stainless firearms [E2; E3] (forum-level, reduced confidence).
• Bronze / brass wool — non-ferrous alloy variants for marine work, near compasses and on non-ferrous metals [A6; A7].
• Steel wool wheels / mounted points — sold for rotary tools; no manufacturer safety documentation was located [A5].

trades

• Woodworking / furniture finishing — rubout and deglossing where the finish maker permits [B1-B4].
• Gunsmithing — bore and metal cleaning, contested and grade-sensitive [E2; E3].
• Automotive detailing/body work — brake-rotor rust removal, though body shops increasingly favor the non-woven pad plus brake cleaner [E4].
• Household cleaning — the soap-pad form (a different product, see above) [F1; F2].
• Pest control — stuffing into rodent entry points is a widely recommended DIY deterrent, though sources note it rusts and degrades faster than copper mesh in damp conditions [E5; E6].
• Fine finishing (ebonizing) — steel wool and vinegar as a wood-dyeing reagent, with the hydrogen controls above [D9].
• Photography / light art — burning, spun wool as a light-painting prop, with the fire controls above [C3].

lineage

parent / ancestor (upstream):

• The wire dish-cloth — a Victorian-era handled tool of small interlinked steel rings, marketed as a scouring implement before industrial steel wool; MadeHow names it as the forerunner, alongside mechanics gathering lathe swarf to polish work [H1].
• Machine-shop swarf — informal use of loose metal turnings as a polishing medium, which the wire-shaving machine later formalized into a manufactured, gradeable product [H1].

functional successors and alternatives (downstream):

• The Non-Woven Abrasive Pad (Scotch-Brite and equivalents) is a functional successor/substitute for the between-coats, deglossing and scuffing jobs, and it avoids these steel-wool liabilities: it sheds no iron, so it does not rust in the wood or react with tannins [B7; sibling entry]. 3M grades its pads directly against steel wool equivalents (gray 7448 about grade 00, white 7445 about grade 0000), a manufacturer-stated substitution mapping [B7] [manual, relayed] (per the reviewer, who checked the 3M pages). That is evidence for substitution, not for the historical claim that the pad was invented specifically because steel wool rusted or stained tannin-rich wood. The original's "built to do the same job without steel wool's one fatal flaw" is withdrawn as an unproved design motive; the causal invention story stays interpretation unless a historical primary source is found.
• Bronze wool / brass wool / stainless steel wool — the same shaving process on other alloys. They are used where ferrous residue, rust, magnetic interference or tannin staining is a problem (marine work, near compasses, non-ferrous metals) [A6; A7]. Sources support that use; they do not show these were invented for that purpose.

contemporaries / siblings: the rigid sanding block and Sanding Sponge (coated grit); the Non-Woven Abrasive Pad (non-woven grit, conditions without leveling, no rust); steel wool (no separate grit; conditions without leveling; the member of this small family that rusts and reacts).

history

origin. Steel wool is described as "a new product" in the trade press in 1896, per a citation traceable through Iron Age (Vol. LVII, p. 871) as reproduced in the Journal of the Iron and Steel Institute [H2]. That is a secondary citation, not a settled earliest date. A modern manufacturer (Global Material Technologies) says it has been in the metal-wool business "since 1896," which is its own marketing claim [H3]. The "founded 1896 by David Wolf in Greenwich, NY" story is UNSUPPORTED [H4].

key evolutions. Before industrial manufacture, the closest antecedents were the Victorian wire dish-cloth and mechanics' lathe swarf [H1]. The step that made steel wool an industrial product was continuous manufacture: a machine draws low-carbon steel wire against a toothed cutting edge, shaving a continuous ribbon of fine fiber, a process described as "similar to broaching" [H5; H1]. Crosby Field, an engineer who joined Brillo Manufacturing Co. as VP in 1923, is credited as the inventor of continuous steel-wool manufacture, including US 1,886,662 ("Wire shaving machine," Brillo as assignee, filed 1928, granted 1932, verified per the reviewer) [manual, relayed], and the patents US 1,646,396 and US 1,886,661 as listed in the original [H6]. Field received the 1953 ASME Medal (verified per the reviewer) [manual, relayed]. The original's "held over 140 patents" was not confirmed in an authoritative source during the review and is removed. US 2,361,672 ("Steel wool," Louis H. Winkler, filed 1940, granted 1944; verified per the reviewer) [manual, relayed]; US 3,969,085 ("Wire and method for making steel wool," correctly titled per the reviewer) [manual, relayed]; and a 2008-published application, US 2008/0286469, show the process still being refined [H7-H9].

✦ human side

traditions & trades. Steel wool is one of the most cross-trade tools in the corpus: woodworkers rub out finishes; gunsmiths use fine grades on bores (a live trade argument, see below); auto-body shops use medium grades on rust; pest-control and plumbing trades reach for it with caveats; and it is a prop in modern light-painting photography [E1-E6].

named hands / makers. Crosby Field is the clearest named inventor — an engineer, not a craftsman. The Smithsonian Institution Archives catalogs a photograph of Crosby Field in the Science Service Records (image SIA2008-0598) and identifies him as the later inventor of steel wool; that is a catalogued photograph, not a collection of his personal papers (the original's "his papers are held" is withdrawn, Fix 4) [H6] [manual, relayed]. Irwin (Edwin) Cox, an aluminum-cookware salesman in San Francisco, is credited with the soap-impregnated pad in 1917, named "S.O.S." — "Save Our Saucepans" — by his wife, the final period dropped so the name could be trademarked [F1]. Brillo Manufacturing Co. was founded in Brooklyn in 1913 by a cookware peddler, his brother-in-law and an attorney, Milton Loeb; the name is Latin for "bright" [F2].

stories — the forum record (anecdote, not safety authority). A woodworking-forum thread carries a first-person near-miss of a steel-wool wad found smoldering; it is a forum account and is not used here to support any causal claim. (The original also quoted a "fire marshal" calling steel wool "the favorite of arsonists" and saying humidity alone can ignite it; that quotation and claim are removed, because authoritative sources support self-heating only for wool saturated with oxidizing oil products, not for plain wool or humidity, per the reviewer.) Gunsmithing forums carry an ongoing argument over steel wool on firearm bores — some swear by 0000 on a brush with solvent, others warn it embeds and rusts — carried at forum confidence, not settled [E2; E3]. Steel-wool photography — burning wool spun on a wire whisk — is a documented hobbyist practice with safety guides warning it burns near 1,300 F / 700 C and has caused structural fires when sparks landed on dry material; its origin could not be dated and is left a gap [C3].

✦ proof of existence

• Earliest dated reference: "a new product" in Iron Age, Vol. LVII, p. 871 (1896), as reproduced in the Journal of the Iron and Steel Institute, Vol. 50, Issue 2, p. 482 [H2] — a secondary citation.
• Named inventor, supported by the patent record: Crosby Field, credited with continuous manufacture; US 1,886,662 "Wire shaving machine" (Brillo assignee; filed 1928, granted 1932, verified per the reviewer) is strong evidence for mechanized metal-wool production, with US 1,646,396 and US 1,886,661 as listed in the original. 1953 ASME Medal (verified per the reviewer). Archival record: a photograph of Crosby Field in the Smithsonian Institution Archives, Science Service Records, which identifies him as the later inventor of steel wool; not a collection of his personal papers. [manual, relayed]
• Patents: US 1,886,662 (Field); US 1,646,396; US 1,886,661; US 2,361,672 "Steel wool" (Winkler, filed 1940, granted 1944); US 3,969,085 "Wire and method for making steel wool"; US 2008/0286469 (2008) [H6-H9]. The patent record, not an archive, is the primary proof.
• Corporate records: Brillo Manufacturing Co., Brooklyn, founded 1913 [F2]; S.O.S Soap Pad, 1917, patented 1918 [F1].
• No museum accession for the tool itself was located — a named gap.

references

URLs are as given in the reviewer's 2026-07-28 Source Notes; entries without a URL had none in the original run. None were re-fetched in this pass; entries that rest on the reviewer's description are marked [manual, relayed].

• [H1] "How Steel Wool is Made," MadeHow.com, Vol. 6 — kind: blog/trade-reference
• [H2] Iron Age, Vol. LVII, p. 871 (1896), as cited via Wikipedia "Steel wool" — kind: trade press (secondary citation)
• [H3] Global Material Technologies / SteelWool.com, "About Us" — kind: manufacturer marketing claim
• [H4] Fandom wiki page, "American Steel Wool Manufacturing Company" — returned no retrievable content; UNVERIFIED
• [H5] Kogel et al. (eds.), Industrial Minerals & Rocks, 7th ed. (SME, 2006), p. 156, as cited via Wikipedia — kind: book
• [H6] "Crosby Field," Wikipedia; Smithsonian Institution Archives, Crosby Field photograph (a photograph in the Science Service Records, not personal papers); ASME Medal recipients [manual, relayed]; US 1,886,662, Wire shaving machine [manual, relayed]
• [H7] US 2,361,672, "Steel wool," L. H. Winkler, 1944 [manual, relayed]
• [H8] US 3,969,085, "Wire and method for making steel wool" [manual, relayed]
• [H9] US Patent Application 2008/0286469, "Method for the Manufacture of Steel Wool and Steel Shot Pellets," 2008
• [A1] MadeHow.com — kind: blog
• [A2] Wikipedia, "Steel wool" — kind: encyclopedia
• [A5] Retail listings for steel-wool drill/rotary attachments — not a safety source
• [A6] Wikipedia, "Bronze wool" — kind: encyclopedia
• [A7] Jon Eakes Fix-It Database — kind: named trade authority (blog)
• [B1] Rockler, "How to Rub Out a Finish"; [B2] Woodcraft, "Rubbing Out a Polyurethane Finish" — retailer trade guides
• [B3] Homax/Rhodes American product/grade spec sheets, via PPG Paints — manufacturer spec; PPG paint-supplies catalog, steel wool and old-paint warning [manual, relayed]; PPG Steel Wool All Grades SDS [manual, relayed]
• [B4] Rockler (technique: paste wax lubricant, with-grain)
• [B5] TDPRI forum thread; Family Handyman steel wool grades guide — forum / blog
• [B7] 3M Scotch-Brite 7448; 3M Scotch-Brite 7445 [manual, relayed]; Heartwood Tools; Empire Abrasives
• [B-lib] Liberon Steel Wool Grade 2 (named in the review; supporting product page, not re-read) [manual, relayed]
• [C1] City of Colorado Springs Fire Department; Idaho Department of Insurance PSA — 9-volt battery safety; Oklahoma City Fire Department, 9-volt battery safety [manual, relayed]
• [C2] madsci.org, steel wool ignition physics — educational blog
• [C3] PictureCorrect; Improve Photography — steel wool photography
• [C4] WoodBarter forum, "Dangers of Steel Wool" — forum; not used for causal claims (the quoted fire-marshal remarks are removed)
• [C5] Firefighter Insider; [C6] Chubb Insurance — retained from the original run; not used for the corrected causal model
• [C7] Cleveland Heights Fire Department, oil-soaked applicator disposal [manual, relayed]
• [C-NTSB] NTSB, oil-based wood-finishing product self-heating [manual, relayed]
• [C8] OSHA, 29 CFR 1910.333 [manual, relayed]
• [C9] JustAnswer Dermatology Q&A — single source, lower confidence
• [C10] Practical Machinist forum, wire-wheel fragment hazard — by analogy
• [D6] General Finishes, steel wool with water-based finishes [manual, relayed]; General Finishes, oil-based stain application and waste warning [manual, relayed]
• [D7] Jon Eakes (tannin/iron-tannate); [D8] Fine Woodworking forum, oak staining account
• [D9] Journal of Wood Science, "Iron acetate solution prepared from steel wool and vinegar for ebonizing wood" — peer-reviewed [manual, relayed] (hydrogen evolution per the reviewer's reading)
• [D10] Fine Woodworking, "Ebonizing Wood with Steel Wool and Vinegar"; [D11] Popular Woodworking, "How To Ebonize Wood" — trade press
• [E2] 1911Forum; [E3] Colt Forum / Cast Bullet Association — gunsmithing forums
• [E4] Family Handyman, brake rotors; [E5] Orkin; [E6] Maximum Pest Control
• [F1] Wikipedia, "S.O.S Soap Pad"; [F2] brillo.com history; Wikipedia, "Brillo Pad"

the structural readings (held as interpretation)

1 — Steel wool is a named predecessor material the corpus built backward. Run 215 named steel wool as the functional predecessor its non-woven-pad entry depended on, without steel wool existing as a node. Building it connects two sourced entries. (The log fact is firm; that this makes it "the first backward-built entry" is Haft's framing, labelled.)

2 — One physical fact, very high surface area for the volume of a ferrous fiber, produces both its hazards and its use. Fine fibers ignite far more easily than solid steel — from a spark, a flame, or the low voltage of a 9-volt battery bridging two fibers by resistive heating — and they also cut and burnish with almost no applied pressure and conform instantly to any shape [C1; C2; B1; B2]. (The pattern comparison with the non-woven pad is Haft's structural comparison, labelled.)

3 — Steel wool's "failure" is also, deliberately, a feature: ebonizing. Iron dissolving in acetic acid gives an iron acetate solution that reacts with wood tannins to form black iron tannate, the working basis of a documented wood-finishing technique, and a peer-reviewed paper documents an iron acetate solution prepared from steel wool and vinegar [D9; D10; D11]. The chemistry is documented, though the reacting solution is more complex than a single simplified ferrous-acetate equation (per the reviewer). That same reaction evolves hydrogen, so it is a chemical preparation with its own safety controls, not just a clever use of a hand abrasive (see the ebonizing gate below). (The "two directions of one story" framing is Haft's, labelled.)

The reviewer's corrections (7)

• BLOCKER — 1. Add hazardous-coating controls to paint-removal matching — Exact claim: “general rust and light paint removal at coarser grades”; matching also lists “light rust and paint removal,” while access calls basic hand use “genuinely beginner-safe.”
• BLOCKER — 2. Correct the spontaneous-combustion causal model — Exact claim: “Residual manufacturing oil (or wax/finish residue from use) left in a piled, damp wad of steel wool can self-heat and ignite”; the human-side section also carries “humidity alone can cause steel wool to burst into flames.”
• BLOCKER — 3. Add hydrogen and vessel-safety controls to the ebonizing revival — Exact claim: “soaking a wad in vinegar to brew ebonizing dye.”
• SHOULD-FIX — 4. Correct the Smithsonian archival claim — Exact claim: “his papers are held in the Smithsonian Institution Archives”; repeated in history, proof of existence, provenance, and confidence.
• SHOULD-FIX — 5. Separate functional succession from unproved design motive — Exact claim: “the synthetic nylon-web pad built to do the same ... job without steel wool's one fatal flaw” and “the whole reason the synthetic pad exists.”
• SHOULD-FIX — 6. Qualify finish compatibility and between-coat use — Exact claim: “Deglossing and scuffing a finish between coats” and “suits ... lacquer, varnish, polyurethane.”
• SHOULD-FIX — 7. Add direct hand, eye, and dust controls — Exact claim: “genuinely beginner-safe for basic hand use”; the danger list gives only a lower-confidence splinter note.