Determination of gloss and gloss The reflection of light on the surface of an object will occur when light is projected on the surface of the object, and the ability of the surface of the object to reflect light is called gloss. The gloss of the surface of different objects is different, and the measure of the ability of the surface to reflect light is called gloss. Gloss is expressed as a percentage. The glossier the surface of an object, the stronger its ability to reflect light and the higher the brightness. The size of the gloss was measured by a photoelectric glossmeter. According to the size of the gloss, the paint can be divided into bright, matt, matt and so on.