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nature : Lacquer of the major components, in about 40% to 70%. Brown mucus. In the air easily oxidized black and viscosity increase. Slightly soluble in water, soluble in alcohol, xylene and other organic solvents. Right skin irritation can lead to swelling or itchy sores. The molecular structure has not been fully established, it was considered one of the benzene ring and two locations on the two hydroxy, three on a long-chain unsaturated - C15H27. Temperature and humidity in the environment can be formed under the film, and with formaldehyde condensation and made urushiol ACETAL varnish.
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