The EU regulations are more strictly than the regulatioins in China. For instance some isolation coatings from China can contain Pb. We would like to proof if a coating contains Pb or not before we ask a laboratory to check the exact amount.
Sodium sulfide http://www.sashas.net/wp-content/uploads/2021/02/Sodium-sulfide-instantly-reveals-lead.pdf
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How Social Media Affects Your Mental Health
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