Abstract: An ?-diketopyrrolopyrrole pigment characterized by giving an X-ray diffraction spectrum in which the ratio of the peak density (I020) for plane index (020) to the peak intensity (I?141) for plane index (?141), I020/I?141 is 0.40 or lower and the ratio of the peak intensity (I?141) for plane index (?141) to the peak intensity (I111) for plane index (111), I?141/I111 is 1.28 or lower. Also provided are: a coloring composition containing this pigment; and a red film formed with this coloring composition. In a color filter formed with ?-diketopyrrolopyrrole pigment, which has that property, the red filter segments have a high contrast ratio and a small absolute value of birefringence. Consequently, a color liquid-crystal display or the like having small viewing-angle dependence and showing excellent display characteristics can be produced.

Abstract: The present invention relates to a complex formed by the coordination between a thiol group-containing compound and a silver ion; an antibacterial, antifungal, and antiviral agent containing the same as the active agent; and an antibacterial, antifungal, and antiviral composition containing the above agent and a vehicle or a carrier.The agent has a wide antibacterial and antifungal spectrum and an antiviral activity, is well compatible with various vehicles and carriers, sustains its activity for long, and has reduced peroral toxicity, skin irritation and mucosa irritation.