{ "@context": "https://schema.org", "@type": "Dataset", "@id": "https://www.z-beam.com/datasets/contaminants/copper-patina-laser-cleaning#dataset", "identifier": "copper-patina-laser-cleaning", "name": "copper-patina", "description": "copper-patina", "url": "https://www.z-beam.com/datasets/contaminants/copper-patina-laser-cleaning", "includedInDataCatalog": { "@type": "DataCatalog", "name": "Z-Beam Laser Cleaning Entity Registry", "url": "https://www.z-beam.com/datasets" }, "variableMeasured": [ { "@type": "PropertyValue", "name": "copperPatinaTypes", "value": "Cu₂O (cuprite, protective), CuO (tenorite), malachite, brochantite, azurite, and atacamite (reactive 'bronze disease')", "propertyID": "contaminant:copper-patina/facts.copperPatinaTypes", "citation": [ { "@id": "#z-beam-copper-laser-cleaning" }, { "@id": "#scirp-cuo-cu2o-optical-properties" } ] }, { "@type": "PropertyValue", "name": "patinaThickness", "value": "10–100 μm over decades outdoors; oxide layer 35–40 μm on archaeological copper — multilayered structure matters", "propertyID": "contaminant:copper-patina/facts.patinaThickness", "citation": [ { "@id": "#di-francia-laser-cleaning-cu-artefacts-2018" }, { "@id": "#vienna-copper-patina-libs-2023" } ] }, { "@type": "PropertyValue", "name": "ablationThresholdCopperOxides", "value": "Cu₂O fs threshold 0.37 J/cm²; ns 1064 nm oxide removal 0.22–0.31 J/cm², melt onset ~0.50 J/cm² — 0.09 J/cm² window", "propertyID": "contaminant:copper-patina/facts.ablationThresholdCopperOxides", "citation": [ { "@id": "#pmc-cu2o-cuo-hybrid-fs-ablation-2021" }, { "@id": "#z-beam-copper-laser-cleaning" }, { "@id": "#di-francia-laser-cleaning-cu-artefacts-2018" }, { "@id": "#vienna-copper-patina-libs-2023" } ] }, { "@type": "PropertyValue", "name": "copperSubstrateDamage", "value": "Copper: 401 W/m·K + 95% reflectivity at 1064 nm — hard to damage. 0.22–0.50 J/cm² window is tight but positive", "propertyID": "contaminant:copper-patina/facts.copperSubstrateDamage", "citation": [ { "@id": "#z-beam-copper-laser-cleaning" }, { "@id": "#joam-cu-ablation-rate-fluence-2015" }, { "@id": "#engineeringtoolbox-thermal-conductivity-metals" } ] }, { "@type": "PropertyValue", "name": "archaeologicalPatinaPreservation", "value": "Laser removes black crust/reactive chlorides while preserving protective green patina — ICOM-CC accepted method", "propertyID": "contaminant:copper-patina/facts.archaeologicalPatinaPreservation", "citation": [ { "@id": "#hal-laser-cleaning-bronze-corrosion-2022" }, { "@id": "#vienna-copper-patina-libs-2023" }, { "@id": "#oceanplayer-laser-cleaning-heritage-conservation" }, { "@id": "#imeko-pulsed-laser-metallic-heritage-2016" }, { "@id": "#lightforart-laser-conservation-metals" } ] }, { "@type": "PropertyValue", "name": "electricalContactCleaning", "value": "Laser commercially deployed for copper busbar cleaning; Lee & Watkins (2000) foundational — no conductivity data gap", "propertyID": "contaminant:copper-patina/facts.electricalContactCleaning", "citation": [ { "@id": "#lee-watkins-laser-oxide-removal-copper-2000" }, { "@id": "#hglaser-copper-busbar-laser-cleaning" }, { "@id": "#laserax-laser-cleaning-metal-contaminants" } ] }, { "@type": "PropertyValue", "name": "laserVsCoinCleaning", "value": "Coin cleaning works with optimized parameters (IMEKO 2018); fails with too-high fluence causing surface melting (JCMS 2020)", "propertyID": "contaminant:copper-patina/facts.laserVsCoinCleaning", "citation": [ { "@id": "#di-francia-laser-cleaning-cu-artefacts-2018" }, { "@id": "#jcms-conservation-coins-ndyag-2020" } ] }, { "@type": "PropertyValue", "name": "bronzeStatueConservation", "value": "Laser cleaning of outdoor bronze monuments is established practice — Jefferson Memorial, Hamilton Monument, Monumento ai Mille", "propertyID": "contaminant:copper-patina/facts.bronzeStatueConservation", "citation": [ { "@id": "#csos-bronze-monument-laser-cleaning" }, { "@id": "#icr-monumento-ai-mille-restoration-2007" }, { "@id": "#culturalheritage-bronze-disease-laser-2019" }, { "@id": "#springer-femtosecond-laser-cleaning-heritage-2023" } ] }, { "@type": "PropertyValue", "name": "copperThermalManagement", "value": "Multi-pulse overlap strategy needed; pre-oxidation increases absorption from 5% to 8% at 1064 nm", "propertyID": "contaminant:copper-patina/facts.copperThermalManagement", "citation": [ { "@id": "#d-nb-laser-deoxidized-copper-2024" }, { "@id": "#z-beam-copper-laser-cleaning" } ] }, { "@type": "PropertyValue", "name": "narrowestMarginCopper", "value": "Thin copper foil / PCB: dielectric underneath limits from below — 0.22 J/cm² oxide removal vs Tg~150°C dielectric damage", "propertyID": "contaminant:copper-patina/facts.narrowestMarginCopper", "citation": [ { "@id": "#z-beam-copper-laser-cleaning" } ] }, { "@type": "PropertyValue", "name": "patinaOpticalConstants", "value": "Cu₂O extinction coefficient 0.005–0.03 at 1064 nm — semi-transparent; UV (266/355 nm) preferred for absorption", "propertyID": "contaminant:copper-patina/facts.patinaOpticalConstants", "citation": [ { "@id": "#columbia-cu-cuo-cu2o-optical-constants-2005" }, { "@id": "#z-beam-copper-laser-cleaning" } ] }, { "@type": "PropertyValue", "name": "absorptionProfile", "value": "Copper oxides have substantially different optical constants from metallic copper at 1064 nm. CuO (tenorite, black, n=2.24 k=1.03 at 355 nm) absorbs IR and visible strongly — dark crust ablates efficiently. Cu₂O (cuprite, red, n=2.4 k=1.44 at 355 nm) has narrower bandgap (~2.1 eV ≈ 590 nm) and absorbs 1064 nm through defect states and stoichiometric deviation. Metallic copper (n=1.34 k=1.93 at 355 nm) reflects >95% at 1064 nm. This is the critical selectivity mechanism: black CuO absorbs → ablates; red Cu₂O participates; bare copper reflects → self-limiting.", "propertyID": "contaminant:copper-patina/facts.absorptionProfile", "citation": [ { "@id": "#columbia-cu-cuo-cu2o-optical-constants-2005" }, { "@id": "#z-beam-copper-laser-cleaning" } ] }, { "@type": "PropertyValue", "name": "formationChemistry", "value": "Copper patina forms through atmospheric corrosion: (1) Protective green patina (verd antique): Cu₄SO₄(OH)₆ (brochantite) + Cu₂CO₃(OH)₂ (malachite), forms over decades in clean atmospheres — a self-passivating, aesthetically valued corrosion layer. (2) Black crust: tenacious CuO (tenorite) + soot/particulate from urban pollution, mixed with gypsum — the 'dirt' layer on architectural bronze that obscures the patina. (3) Bronze disease: CuCl + H₂O + O₂ → Cu₂(OH)₃Cl (atacamite), cyclical, destructive at >42% RH. The protective green patina is NOT a contaminant — black crust on top of patina is.", "propertyID": "contaminant:copper-patina/facts.formationChemistry", "citation": [ { "@id": "#z-beam-copper-laser-cleaning" }, { "@id": "#scirp-cuo-cu2o-optical-properties" } ] }, { "@type": "PropertyValue", "name": "detectionMethods", "value": "XRF (X-ray fluorescence) differentiates green patina (S, Cl peaks) from black crust (Fe, Pb peaks from airborne particulate); Raman spectroscopy identifies CuO (296, 346, 632 cm⁻¹) vs Cu₂O (218, 523, 623 cm⁻¹) vs brochantite (420, 602, 974, 1120 cm⁻¹); cross-section microscopy reveals residual black crust on patina surface; NPS Preservation Brief standards for architectural copper/bronze assessment", "propertyID": "contaminant:copper-patina/facts.detectionMethods", "citation": [ { "@id": "#z-beam-copper-laser-cleaning" }, { "@id": "#scirp-cuo-cu2o-optical-properties" } ] }, { "@type": "PropertyValue", "name": "byproducts", "value": "{\"airborne\":\"CuO/Cu₂O particulate and gypsum dust from black crust removal; minimal copper metal particulate (self-limiting process protects copper substrate)\",\"filtration\":\"HEPA/P100 particulate extraction required; copper particulate has occupational exposure limits (OSHA PEL 0.1 mg/m³ for copper fume)\",\"wasteClassification\":\"Copper oxide particulate — non-hazardous in small quantities; large-scale architectural work may trigger waste classification based on copper content\"}", "propertyID": "contaminant:copper-patina/facts.byproducts", "citation": [ { "@id": "#z-beam-copper-laser-cleaning" }, { "@id": "#scirp-cuo-cu2o-optical-properties" } ] }, { "@type": "PropertyValue", "name": "downstreamCompatibility", "value": "{\"recontamination\":\"Clean copper re-patinates naturally over years in atmospheric exposure — not a rapid recontamination issue. Conservation goal is to preserve the existing protective patina, not expose bare metal\",\"surfaceReadiness\":\"Preservation standard: green patina is preserved as-is; black crust is removed from patina surface. Copper roof/bronze sculpture conservation: laser removes black pollutant crust while leaving the underlying patina intact. Lacquer or microcrystalline wax is applied after cleaning for long-term protection — standard conservation practice. CRITICAL: the green patina layer itself must be PRESERVED — laser must stop at the patina surface, not penetrate to bare copper\"}", "propertyID": "contaminant:copper-patina/facts.downstreamCompatibility", "citation": [ { "@id": "#z-beam-copper-laser-cleaning" } ] }, { "@type": "PropertyValue", "name": "laserDamageThreshold", "value": "0.5–4", "propertyID": "contaminant:copper-patina/facts.laserDamageThreshold", "unitText": "J/cm²", "wavelengthNm": 1064, "pulseRegime": "ns", "citation": [ { "@id": "#di-francia-laser-cleaning-cu-artefacts-2018" }, { "@id": "#mdpi-laser-cleaning-patina-depth-2025" } ] } ], "measurementTechnique": "Laser cleaning parameter measurement", "license": { "@type": "CreativeWork", "name": "CC BY 4.0", "url": "https://creativecommons.org/licenses/by/4.0/" }, "creator": { "@type": "Organization", "name": "Z-Beam Laser Cleaning" }, "publisher": { "@type": "Organization", "name": "Z-Beam Laser Cleaning", "url": "https://www.z-beam.com" }, "dateModified": "2026-08-31", "version": "3.0", "citation": [ { "@type": "ScholarlyArticle", "@id": "#columbia-cu-cuo-cu2o-optical-constants-2005", "headline": "Effect of Pulsing Parameters on Laser Ablative Cleaning of Copper Oxides", "sameAs": "http://www.columbia.edu/~yly1/PDFs3/M602_2005.pdf" }, { "@type": "ScholarlyArticle", "@id": "#csos-bronze-monument-laser-cleaning", "headline": "Conservation of Sculpture and Objects Studio — Outdoor Bronze Monument Laser Cleaning", "sameAs": "http://www.wesaveart.com" }, { "@type": "ScholarlyArticle", "@id": "#culturalheritage-bronze-disease-laser-2019", "headline": "A Preliminary Investigation into the Use of Laser Cleaning to Stabilize Bronze Disease", "sameAs": "https://resources.culturalheritage.org/osg-postprints/v26/frank" }, { "@type": "ScholarlyArticle", "@id": "#d-nb-laser-deoxidized-copper-2024", "headline": "Al-Cu Composite Casting of Laser-Deoxidized Copper", "sameAs": "https://d-nb.info/1391066391/34" }, { "@type": "ScholarlyArticle", "@id": "#di-francia-laser-cleaning-cu-artefacts-2018", "headline": "Laser cleaning of Cu-based artefacts: laser/corrosion products interaction", "sameAs": "https://acta.imeko.org/index.php/acta-imeko/article/view/IMEKO-ACTA-07%20%282018%29-03-16/pdf" }, { "@type": "ScholarlyArticle", "@id": "#engineeringtoolbox-thermal-conductivity-metals", "headline": "Thermal Conductivity of Metals and Alloys — Engineering Toolbox", "sameAs": "https://www.engineeringtoolbox.com/thermal-conductivity-metals-d_858.html" }, { "@type": "ScholarlyArticle", "@id": "#hal-laser-cleaning-bronze-corrosion-2022", "headline": "Laser-cleaning effects induced on different types of bronze corrosion products", "sameAs": "https://hal.science/hal-04266303/file/AppSurf%20Sci%202022_Di%20Francia-Grassini-Neff%20et%20al-laser%20cleaning-pdf.pdf" }, { "@type": "ScholarlyArticle", "@id": "#hglaser-copper-busbar-laser-cleaning", "headline": "Copper Busbar Laser Cleaning Equipment (Dual Station) — HGTECH", "sameAs": "https://www.hglaserglobal.com/Busbar-Laser-Cleaning.html" }, { "@type": "ScholarlyArticle", "@id": "#icr-monumento-ai-mille-restoration-2007", "headline": "The Conservation of Outdoor Bronze Monuments: The Restoration Project for the Monumento ai Mille", "sameAs": "https://www.ndt.net/article/art2008/papers/226Mercalli.pdf" }, { "@type": "ScholarlyArticle", "@id": "#imeko-pulsed-laser-metallic-heritage-2016", "headline": "Pulsed laser cleaning of metallic heritage", "sameAs": "https://www.imeko.info/publications/tc4-Archaeo-2016/IMEKO-TC4-ARCHAEO-2016-16.pdf" }, { "@type": "ScholarlyArticle", "@id": "#jcms-conservation-coins-ndyag-2020", "headline": "The Conservation of Early Post-Medieval Period Coins", "sameAs": "https://jcms-journal.com/articles/10.5334/jcms.1021204" }, { "@type": "ScholarlyArticle", "@id": "#joam-cu-ablation-rate-fluence-2015", "headline": "The dependence of the ablation rate of metals on nanosecond laser fluence and wavelength", "sameAs": "https://joam.inoe.ro/articles/the-dependence-of-the-ablation-rate-of-metals-on-nanosecond-laser-fluence-and-wavelength/fulltext" }, { "@type": "ScholarlyArticle", "@id": "#laserax-laser-cleaning-metal-contaminants", "headline": "Laser Cleaning Performance for Metal Contaminants — Laserax", "sameAs": "https://www.laserax.com/laser-cleaning-metal-contaminants" }, { "@type": "ScholarlyArticle", "@id": "#lee-watkins-laser-oxide-removal-copper-2000", "headline": "Laser removal of oxides and particles from copper surfaces for microelectronic fabrication", "sameAs": "https://opg.optica.org/oe/fulltext.cfm?uri=oe-7-2-68" }, { "@type": "ScholarlyArticle", "@id": "#lightforart-laser-conservation-metals", "headline": "Laser Cleaning of Metals — Light for Art / El.En. Group", "sameAs": "https://www.lightforart.com/en/laser-restoration-application-fields/laser-conservation-metals" }, { "@type": "ScholarlyArticle", "@id": "#mdpi-laser-cleaning-patina-depth-2025", "headline": "Laser Cleaning and Patina Depth Profiles of New and Ancient Copper", "sameAs": "https://www.mdpi.com/2571-9408/9/6/221" }, { "@type": "ScholarlyArticle", "@id": "#oceanplayer-laser-cleaning-heritage-conservation", "headline": "The Science of Laser Cleaning for Heritage Conservation — OceanPlayer", "sameAs": "https://oceanplayer.com/the-science-of-laser-cleaning-for-heritage-conservation" }, { "@type": "ScholarlyArticle", "@id": "#pmc-cu2o-cuo-hybrid-fs-ablation-2021", "headline": "Nanoscale-Precision Removal of Copper in Integrated Circuits Based on a Hybrid Process of Plasma Oxidation and Femtosecond Laser Ablation", "sameAs": "https://pmc.ncbi.nlm.nih.gov/articles/PMC8537610" }, { "@type": "ScholarlyArticle", "@id": "#scirp-cuo-cu2o-optical-properties", "headline": "A Comparison of Optical Properties of CuO and Cu₂O Thin Films for Solar Cell Applications", "sameAs": "https://www.scirp.org/journal/paperinformation?paperid=110323" }, { "@type": "ScholarlyArticle", "@id": "#springer-femtosecond-laser-cleaning-heritage-2023", "headline": "Towards safe and effective femtosecond laser cleaning for the preservation of cultural heritage", "sameAs": "https://link.springer.com/article/10.1007/s00339-023-06455-x" }, { "@type": "ScholarlyArticle", "@id": "#vienna-copper-patina-libs-2023", "headline": "Laser diagnostics and processing of historical and artificial copper patina", "sameAs": "https://ucrisportal.univie.ac.at/en/publications/laser-diagnostics-and-processing-of-historical-and-artificial-cop" }, { "@type": "ScholarlyArticle", "@id": "#z-beam-copper-laser-cleaning", "headline": "Copper Laser Cleaning — Z-Beam", "sameAs": "https://www.z-beam.com/materials/metal/non-ferrous/copper-laser-cleaning" } ] }