What is the chemical name of black lacquer

What is the chemical name of black lacquer?

$Nh\u1eefng b\u1ed9 b\u00e0n tr\u00e0 \u0111\u1eb9p, sang tr\u1ecdng, cao c\u1ea5p - Khay Tr\u00e0 Phong Th\u1ee7y$ Black lacquer is Xem tranh g? treo t??ng obtained from the varnish tree that yields a toxic exudation. The chemical name of black lacquer is pyroxylin.