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https://ttl-labs.com/jewelry-testing/
TTL Laboratories is proud to to test jewelry for lead and offer comprehensive compliance testing for jewelry, jewelry components and findings in order to determine compliance with the federal and state requirements, which have been implemented to address these safety concerns. As an ISO/IEC 17025:2005 accredited and CPSC-accepted third party ...
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.
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