Coating Terms

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If the incoming light (incident light) on a substrate is reflected in a broad range of directions instead of a single outgoing direction, mattness occurs. Paints and clear coats are classified according to the mattness they have as silk, semi matt or satin, matt or flat and eggshell. However, there is no common opinion in the paint industry on the gloss levels corresponding to these mattness classes. A common misperception is that matt surfaces reflect less light. A matt surface reflects light as much as a gloss surface does. The difference is, light reflected from matt surfaces comes to the eye in a whole range of angles, whereas, light from glossy surfaces comes making the same angle of incident light with respect to the surface normal. Reflected light form a surface depends on the color not the gloss of the surface.