No, carbonised bamboo flooring is not stained. It is darker in colour than natural bamboo flooring because it has been smoked in an industrial kiln during the manufacturing process. This process of smoking (or carbonising) creates a darker, more coffee coloured bamboo.
To create the carbonised effect, the strips or strands of bamboo are firstly boiled and dried, and then smoked under extreme heat and pressure to achieve the desired effect. They are then made into the bamboo flooring planks in exactly the same way as natural bamboo flooring. Carbonised bamboo flooring accessories and mouldings are also available to accompany your choice of flooring.