If a polyurethane varnish (not lacquer) contained linseed oil, it COULD have lead in it - lead is a drying agent for that oil. It was mostly used in paints as a pigment. Varnish has no pigment and it dries by chemical reaction, so most polyurethane varnishes don't need lead.
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Crystal glass contain lead.
Newsprint does not contain lead. It is typically made from wood pulp and does not require the use of lead in its production process.
Polyurethane can be recycled.
yes they do
No, Armetale is a type of aluminum-based alloy that does not contain lead. It is safe for use with food and does not leach harmful chemicals.