There is such a product having some metallic appearance on its top finish as plated surface, alumite-processed aluminum surface or surface painted by ink with mixed aluminum powder. For the quality control of such particular surfaces, there will be a case that color measurement and evaluation under normal conditions will not be enough. In fact, when such a product’s variable angle luminous intensity distribution is checked, there is certain significant difference from a surface of product without metallic appearance. The Figure 3 below shows an example to have measured variable angle luminous intensity distribution of solid gray and metallic silver using a variable angle photometer. Measuring conditions were 45° fixed of incident angle and -70° to +70° of light receiving angle (r) at 5° intervals, and light amount of reflected light was measured for each incident angle. The Figure 4 below shows a graph of this measurement data. When seeing this graph, there is no significant difference between the both cases about 0° light receiving (equivalent to observation from direct overhead), while metallic silver becomes significantly dark compared with solid gray when a light receiving angle shifts to the (-) position, and metallic silver becomes significantly bright compared with solid gray when a light receiving angle shifts to the (+) position. In other words, a product having metallic appearance on its top finish has a behavior that brightness of both colors will change places each other due to very little angle difference at the time of observation.