Species of Timber Commonly Available
Colours and grain patterns can vary widely from the examples shown, but the photographs are intended as a reasonable guideline as to what you might expect in the selected timber. It should be appreciated that timber is a natural product and therefore no two pieces are exactly the same.
The property that causes timber to swell and shrink due to air moisture, is called hygroscopicity. The common method of preventing this is to seal the surface of timber so it cannot freely come into contact with the air. Paints, varnishes and lacquers are used for this purpose. All faces of the timber, seen and unseen, should be coated, paying particular attention to end grain surfaces.