By heating and scorching the bamboo with fire, the binding of cellulose, which is the main component of fiber and vascular bundles of the bamboo, becomes gradually stronger and transforms into a natural carbon based fiber with graphite in the end.
竹は火を入れ焦がす事により、竹の繊維・維管束の主成分セルロースの結合が次第に強くなって行き、最終的にグラファイトをした天然の炭素繊維になる。