Raw lacquer is made when impurities and excess water are removed from lacquer sap. Exposed to air, the lacquer resin reacts with the oxygen by drying and hardening. It forms a surface as hard as stone, resistant both to strong acids and strong alkalines. It is rustproof, waterproof and insect-proof.
漆是由漆樹採集下來的透明汁液，一旦接觸空氣後，內含的漆酸與氧氣結合乾涸後，便會堅硬如石，不畏強酸強鹼，並可防水、防蛀、防鏽。