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http://www.skyrayxrf.com/test-for-lead.php
X-Ray Fluorescence (XRF) is a non-destructive testing method that can read below the parts-per-million (ppm) levels in the various regulations on jewelry. XRF has been proven as an effective screening tool for hazardous substances and is widely accepted as an appropriate method for in-house screening of lead in jewelry.
https://dtsc.ca.gov/toxics-in-products/lead-in-jewelry/
Lead In Jewelry. Lead has often been used in jewelry, to make the article heavier, brighten colors, and to stabilize or soften plastic. However, lead can be dangerous, even deadly when used in jewelry. The state of California regulates lead in jewelry to help prevent it from harming people. Toxic Jewelry …
https://www.chemsee.com/residential/detection-kits-for-lead/
SprayView™-Lead Detection Kits detect lead on surfaces instantly by developing a red color. Detection Methods: Two Models of SprayView™-Lead Detection Kits are avaliable: Model # SV-LD-SP Spray Detection Kit; Model # SV-LD-SB Swab Detection Kit; SprayView™-Lead Spray Kit: The SprayView™-Lead Spray Kit uses two spray bottles to detect lead.
https://www.instructables.com/community/Request-How-can-I-test-jewelry-components-for-lea/
Lead (II) cations and the sulphide anions react to form the insoluble Lead sulphide which is a distinctive brown solid. If you only need to test qualitatively for the presence of lead on the surface of an object, a cotton swap dipped in distilled water wiped across the surface should turn brown when sodium sulphide solution is dropped onto it.
https://chemistry.stackexchange.com/questions/143952/how-does-lead-toxicity-from-jewelry-happen-vs-occupational-exposure
First, I am wondering what form the lead is in when it's found in jewelry metal alloys (not painted) and how exactly it gets to be toxic from there or what happens when you touch it (ions, oxidation?). I can't find any other information online about the form of lead in jewelry. I know it's inorganic lead and was told by friends it's elemental ...
https://www.canada.ca/en/conservation-institute/services/conservation-preservation-publications/canadian-conservation-institute-notes/test-copper-lead.html
Spot tests can also be used to detect lead in pigments, ceramics and white corrosion products. For example, lead was identified in the white corrosion products on a miniature cannon made with a shiny yellow metal (probably brass) indicating that the alloy used contained lead. The cannon was inside an oak display case together with wooden objects.
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