shellac

This wood finish is composed of a natural resin secreted by the tiny lac insect. After laying its eggs on certain trees in India and Thailand, and ingesting the sap of those trees, the lac secretes the digested tree sap to cover it's swarm of eggs. Upon contact with air, the secretion forms into a hard shell, thus the name. It's literally the shell of the lac insect. After the young insects are born, the remaining shell is harvested to make shellac. It is soaked in water and dried in the sun. It is then dissolved into ethyl alcohol, isopropyl alcohol, and methyl isobutyl ketone. Once it is applied and the volatile solvents evaporate, what is left is the natural shell, just as it is produced by the insect. Shellac gives a natural protective coating to wood, can block odors (can be used to seal formaldehyde odors from particleboard), and can be tinted. Shellac is UV resistant and will not yellow or darken with age. Dry shellac is so safe, it is certified by the Food and Drug Administration as a protective glaze for candy and pharmaceuticals. Read their detailed brochure "The Story of Shellac" which details the history and manufacturing process. NOTE: While dry shellac is completely natural and nontoxic when dry, in the can it has toxic solvents. Be sure to apply in a well-ventilated area and take appropriate precautions.