Abstract: The invention provides a method of manufacturing a metal foil for an electrolytic capacitor. In the case of slitting a wide metal strip subjected to etching treatment into a predetermined size with a cutting blade, a slitting portion of the heated wide metal strip is slit to provide the metal foil with few burrs and cracks at the slit edge surface.

Abstract: The invention provides a method of manufacturing a metal foil for an electrolytic capacitor. In the case of slitting a wide metal strip subjected to etching treatment into a predetermined size with a cutting blade, a slitting portion of the heated wide metal strip is slit to provide the metal foil with few burrs and cracks at the slit edge surface.

Abstract: A process of producing an article having a surface provided with an optical diffraction grating such that the surface generates visible color when illuminated with diffuse white light. The process involves deforming a starting material to produce the article having the surface and, during the deforming step, impressing a diffraction relief pattern on the surface by a tool provided with a bearing surface having a corresponding surface relief pattern of parallel lines that contacts the surface of the article under pressure. While the diffraction relief patter is being impressed, the surface is caused to slide in a direction of movement relative to the bearing surface of the tool. The invention also relates to the article.