| 摘要 |
An aesthetically enhanced building board is disclosed which is obtained by applying an effective shade coating to concavities of a building board having linear, curved, continuous or discontinuous concavities or any other concavities. In accordance with a cross-sectional geometry in crosswise direction of a groove 5 formed in a surface of a building board (A), level (hs), position (m), and jetting angle ( alpha ) are controlled, thereby a coating is applied in such a manner that color of the coating is deepest in a bottom of the groove 5 and, in sides, it becomes lighter from the bottom to the surface.
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