{"hq_id":"hq-p-spe-000202","name":"Stained Glass Soldering (Lead Fumes, Lead-Tin Solder, Zinc Chloride Flux, Hand-to-Mouth Lead Transfer)","category":{"primary":"specialty_art","secondary":"stained_glass","tags":["stained glass","solder","lead","tin","lead fume","flux","zinc chloride","rosin flux","copper foil","came","hand contamination","ventilation"]},"product_tier":"SPE","overall_risk_level":"high","description":"Stained glass crafting involves joining glass pieces using lead came (H-shaped lead channels) or copper foil (Tiffany technique), both soldered with lead-tin alloy (typically 60/40 or 50/50 Sn/Pb) using acid-based (zinc chloride) or rosin-based flux. This craft generates multiple lead exposure pathways: (1) lead fume inhalation during soldering — soldering irons operate at 370-430C, and while lead melting point (327C) is reached, significant lead fume generation occurs primarily above 450C, meaning properly controlled soldering produces limited airborne lead but overheating is common in practice; (2) hand contamination from handling lead came, solder, and lead-contaminated work surfaces — by far the dominant exposure route, as hand-to-mouth transfer of lead particles delivers orders of magnitude more lead than inhalation during hobby soldering; and (3) flux fume inhalation — zinc chloride flux fumes cause metal fume fever and respiratory irritation, while rosin (colophony) flux fumes cause occupational asthma in 5-10% of chronically exposed workers. Blood lead level studies of stained glass hobbyists consistently show elevations of 10-40 ug/dL above non-exposed controls, with hand contamination (not inhalation) identified as the primary exposure pathway. The craft is experiencing a resurgence driven by social media, with many newcomers unaware of lead hygiene requirements.","synthesis":{"derived_risk_level":"high","synthesis_confidence":0.744,"synthesis_method":"compound_composition","context_used":"human_adult","context_source":"product_users","exposure_modifier":1,"vulnerability_escalated":false,"escalation_reason":null,"compounds_resolved":1,"compounds_total":1,"synthesis_date":"2026-05-09","synthesis_version":"1.2.0","methodology_note":"exposure_modifier and adjusted_magnitude are computed from ALETHEIA-calibrated heuristics (route × duration × frequency multipliers, clamped to [0.5, 1.4]). Multipliers are directionally informed by EPA Exposure Factors Handbook (2011) and CalEPA OEHHA but are not regulatory consensus. See /api/methodology for full disclosure."},"hazard_summary":{"sensitive_populations":"women of childbearing age (lead crosses placenta at any BLL), children in the household (take-home lead contamination), hobbyists without lead hygiene training, individuals with existing kidney disease (lead nephrotoxic)","overall_risk":"high","primary_concerns":["Hand-to-mouth lead transfer is the dominant exposure pathway — blood lead elevations of 10-40 ug/dL documented in hobbyists","No safe blood lead level exists — effects on cardiovascular and renal systems documented even below 5 ug/dL","Take-home lead contamination: clothing, work surfaces, and tools carry lead to living spaces and family members","Rosin flux fumes cause permanent occupational asthma in 5-10% of chronically exposed individuals"],"exposure_routes":"Ingestion (primary — hand-to-mouth transfer of lead particles from handling solder, came, and contaminated surfaces). Inhalation (solder fumes, flux fumes). Dermal (lead particle skin contamination)."},"exposure":{"routes":["ingestion","inhalation","dermal"],"contact_types":["ingestion_hand_to_mouth","inhalation_fume","dermal_contact"],"users":["adult","hobbyist"],"duration":"chronic","frequency":"weekly","scenarios":["Hobbyist solders stained glass panel for 2 hours — hands contaminated with lead particles, transferred to mouth during eating/drinking/smoking without handwashing","Overheated soldering iron (>450C) generates visible lead fume — hobbyist inhales without ventilation or respiratory protection","Zinc chloride flux fumes cause coughing and metal fume fever symptoms during extended soldering session","Lead came handling contaminates work surface, tools, clothing — secondary lead exposure to household members"],"notes":"Lead exposure pathways: hand contamination > inhalation for hobby stained glass. Maas et al. (Am J Ind Med 2004): stained glass hobbyists mean BLL 11.2 ug/dL vs 2.2 ug/dL controls. Soldering fume: lead fume significant above 450C; at normal soldering temperature (370-430C) lead fume is limited but present. Flux fumes: zinc chloride (ZnCl2) — respiratory irritant, metal fume fever. Rosin (colophony) — causes occupational asthma in 5-10% of chronically exposed workers (potent respiratory sensitizer). CDC reference BLL: 5 ug/dL for adults (2015). No safe blood lead level established. Lead hygiene: NEVER eat, drink, or smoke in the work area. Wash hands immediately after handling lead."},"consumer_guidance":{"usage_warning":"ALWAYS wash hands thoroughly with cold water and soap immediately after handling lead solder, came, or any work materials. NEVER eat, drink, or smoke in the stained glass work area. Work on a dedicated surface covered with disposable paper that is discarded after each session. Use a fume extractor or work with cross-ventilation to draw flux and solder fumes away from your breathing zone. Change clothes and wash hands before touching children, pets, or household surfaces. Consider blood lead level testing through your physician if you solder regularly.","safer_alternatives":["Lead-free solder (96.5/3/0.5 Sn/Ag/Cu) — higher melting point but eliminates lead exposure","Lead-free came (zinc or copper came alternatives — different working properties)","Fusing (kiln-formed glass) — no soldering required","Mosaic glass techniques using adhesive instead of solder"]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"OSHA Lead Standards and CDC Blood Lead Reference Value","citation":"OSHA 29 CFR 1910.1025 (General Industry Lead Standard); CDC Adult Blood Lead Reference Value 3.5 ug/dL (2022); ASTM D4236","requirements":"OSHA lead standard: action level 30 ug/m3 airborne lead (8-hr TWA), PEL 50 ug/m3. Medical removal at BLL ≥50 ug/dL. Applies to employers but NOT home hobbyists. CDC adult BLL reference value reduced to 3.5 ug/dL (2022). ASTM D4236: lead solder and came sold as art materials must be labeled with lead hazard warnings. California Proposition 65: lead listed as carcinogen and reproductive toxicant; products must carry Prop 65 warnings.","compliance_status":null,"effective_date":null,"enforcing_agency":"OSHA (workplace); CDC (BLL surveillance); CPSC (art material labeling)","penalties":null,"source_ref":null}],"certifications":[],"labeling":{"required_disclosures":[],"prop65_warning":{"required":null,"chemicals":[],"endpoint":null,"notes":null},"ghs_labeling":{"required":null,"signal_word":null,"pictograms":[],"hazard_statements":[],"notes":null},"hidden_ingredients":{"trade_secret_protected":null,"categories_hidden":[],"estimated_count":null,"known_concerns":null,"notes":null},"notes":null},"recalls":[],"regulatory_gap":null,"notes":null},"lifecycle":{"recyclable":true,"disposal_guidance":"Collect all lead scraps, solder drips, and came off-cuts in a sealed container and recycle through scrap metal dealers or hazardous waste collection. Do not discard lead in regular trash. Clean work surface with damp disposable wipes — never dry sweep.","hazardous_waste":true,"expected_lifespan":"Finished stained glass panels: decades to centuries. Lead came oxidizes to lead carbonate (white patina) over years but maintains structural integrity."},"formulation":{"form":"varies","key_ingredients":[],"certifications":[]},"materials":{"common":[],"concerning":[],"preferred":[]},"compound_composition":[{"hq_id":"hq-c-ino-000001","compound_name":null,"role":"solder_component","typical_concentration":"lead-tin solder (50-60% Sn, 40-50% Pb); lead came (pure lead or 95/5 Pb/Sn); blood lead elevations of 10-40 ug/dL documented in stained glass hobbyists"}],"identifiers":{"common_names":["stained glass soldering (lead fumes, lead-tin solder, zinc chloride flux, hand-to-mouth lead transfer)"],"aliases":[],"manufacturer":null,"brands":[]},"brand_examples":[],"brand_examples_disclaimer":null,"sources":[{"type":"expert_curation","name":"ALETHEIA Safety Database","date":"2026-03-26"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-26","timestamp":"2026-05-14T01:30:49.192Z"}}