| 摘要 |
PROBLEM TO BE SOLVED: To provide a color ink usable for various kinds of printing methods such as mimeograph printing and relief printing, enabling a clear color print to be printed on various kinds of paper sheets such as a western-style paper sheet, cloth, a metal plate, and effectively exhibiting far infrared function. SOLUTION: Black silica is processed to form fine powder having <=3μm particle diameter, and the obtained fine powder of the black silica is fired preferably within a temperature range of 500-800 deg.C to provide a white powder. The resultant white powder in an adequate amount is added to an ink material for printing in combination with a pigment, and the resultant mixture is homogeneously mixed to provide the objective color ink. |
