They may be dyed and the dyes are very permanent. The triacetates are made by dissolving triacetate in alcohol and methylene chloride and spinning it. Acetate fibers dry rapidly, are soft, resist wrinkling, and are not attacked by moths and molds. Cork Cork is not wood, but part of the phellogen derived material. Cork is an excellent insulating material because it has numerous air-filled cells.
Cork is lightweight and floats well.
The bark can be stripped from the trees when they are about 25 years old. They can be stripped each 9-10 years after that. Bamboo Bamboo is not wood because it doesn't contain any secondary growth. In much of the tropical third world bamboo replaces wood. This name applies to a number of species of the subfamily Bambusoideae, of the Poaceae.