Spectrophotometers and Porcelain Bathtubs

Previously, this company manufactured both the cast porcelain bathtubs and the porcelainized steel sheet parts which are attached to the front of the cast porcelain bathtubs. However, the porcelainized steel sheet parts are now purchased from an outside supplier. Therefore, it has become necessary to check the color of those parts in the reception process, so that the color of the purchased parts matches the color of the bathtub bodies. The outside supplier has the same color samples as this manufacturer, and checks the color difference from that of the samples. When a new color is produced, production samples are actually attached to the porcelain bathtubs, and the completed assemblies are carried to an inspection room equipped with various standard light sources. There, the color is evaluated by eye and the numerical tolerance values of color control are determined by measuring the color. When receiving materials or examining a new color, the porcelain is checked by firing it on a small plate.