Brass Laser Cleaning
Brass hardware and fixtures can shed tarnish and old lacquer with a dry laser pass when energy stays on the soil and zinc is not driven out of the surface. Acid dips are the usual...
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Alessandro MorettiPh.D.Italy
Materials process development for ceramics and alloysPublished
Apr 30, 2026
Antique National Cash Register Laser Cleaning
Laser cleaning removes tarnish, grime, and old wax from an antique National cash register's brass trim and cast iron case without stripping the nickel plating or the factory finish underneath. The beam clears flat panels quickly but requires slower, lower-power passes across precision surfaces such as gear teeth, hinges, and embossed lettering, where too much heat can warp thin brass. It will not repair dents, replace missing keys or drawer parts, or restore locked mechanisms; that work still requires a machinist.
What This Video Shows
Short jfBBxfbF0UY shows pulsed laser lifting paint, tarnish, and rust from an antique National cash register while ornamental brass engravings stay sharp.
Brass, Cast Iron, and Wood on a Vintage Register
Related Contaminants
Clear Atmospheric Rust Without Cooking the Steel
Iron oxide rust is removed from [steel](/materials/steel-laser-cleaning) at **0.1–0.5 J/cm²**, well under the **8–15 J/cm²** where the base metal starts to take damage, so a coupon cut from the actual part, not the color of the rust or any [mill scale](/contaminants/mill-scale-magnetite-laser-cleaning) under it, should set the energy.
Laser Cleaning Paint Coatings Without Hurting the Surface
Paint coatings come off [stucco](/materials/stucco-laser-cleaning) at 0.5–2 J/cm², while the stucco itself is injured at 8–14 J/cm², so a setting that removes paint has to stay near the low end of that range. The same logic runs through [laser paint coating removal](/applications/laser-paint-coating-removal-bay-area) on any host.
Hard Coatings Laser Cleaning
Stripping a PVD or CVD hard coating from tool steel is a narrow band, since about 2–4 J/cm² removes the coating while 8–12 J/cm² injures the host steel. Bay Area tool remanufacturers should treat a glossy flank face as a screening test only, because recoating contracts need a chemical strip-complete criterion.
Weld Heat Tint Laser Cleaning
Laser cleaning removes weld heat tint from stainless steel at 0.5–1.5 J/cm², but 5–12 J/cm² injures the metal underneath, and a clean look does not prove corrosion resistance returned.
Heat-Treated Oxide Scale laser cleaning
Stainless steel carrying oxide scale leaves a narrow margin, with scale coming off at 1.5–4 J/cm² and damage to the stainless itself starting at 5–12 J/cm², while on hot-rolled carbon steel AMPP SP21511-1 says pulsed laser ablation will not productively remove intact mill scale, so the metal and the scale condition decide whether laser cleaning is the right tool.
Laser Cleaning Anodized Aluminum Without Host Injury
Anodized aluminum on [aluminum](/materials/aluminum-laser-cleaning) clears near 1.5–4 J/cm² while the host is injured near 2–5 J/cm², so the safe setting follows that narrow aluminum × anodized aluminum pair on a labeled coupon.
