The natural veneer is a thin slice of wood obtained from the outermost layer of a tree trunk, which is called the "Bark." the slice is typically between 0.3 and 1.5 millimeters thick and is cut using a special slicing or peeling technique. The resulting veneer is then used to cover or laminate surfaces such as furniture, walls, and floors, giving them a natural wood appearance.
Natural veneer is different from artificial or synthetic veneer, which is made from materials such as paper or plastic and is designed to mimic the look of real wood. Natural veneer, on the other hand, is a genuine wood product and has all the characteristics of wood, including variations in grain pattern, color, and texture. It is also more durable and long-lasting than synthetic veneer.

There are a wide variety of wood species used in veneers, each with its own unique characteristics in terms of grain pattern, color, and texture. Some of the most common wood species used for veneers include:
1. Oak: Oak veneer is a popular choice for its durability and distinctive grain pattern.
2. Maple: Maple veneer is known for its smooth, uniform grain and light color.
3. Walnut: Walnut veneer has a rich, dark color and a distinctive, wavy grain pattern.
4. Cherry: Cherry veneer has a warm, reddish-brown color and a fine, uniform grain pattern.
5. Mahogany: Mahogany veneer has a deep, rich color and a distinctive, straight grain pattern.
6. Ash: Ash veneer has a light color and a distinctive, pronounced grain pattern.
7. Teak: Teak veneer has a warm, golden color and a uniform grain pattern.
8. Rosewood: Rosewood veneer has a rich, reddish-brown color and a distinctive, intricate grain pattern

When water is applied to a veneer, it penetrates the wood fibers and causes them to swell. This can enhance the natural color and grain pattern of the wood, making it more pronounced and attractive and it gives a better idea of how it looks after finish and polish. Additionally, raising the grain can also help to remove any dust or debris that may be present on the surface of the veneer, making it easier to sand and finish.