3YAMANE KOICHI,IKEDA REIKO.Darkening agent for colored solid and darkening [P].JP9256280,1997-09-30.
4SHIMIZU KUNIO,SUZUKI YASUYUKI.Color-deepening agent and deepening of color [P].JP9291486,1997-11-11.
5ZEZU SACHIKO,OSAWA YOSHITO.Color-deepe-ning agent for synthetic fiber [P].JP11081147,1999-03-26.
6KATO TADAHIKO,SAITO YOSHITAKA etc.Deepening agent for colored fiber and method for deepening color of fiber using the agent [P].JP2001288683,2001-10-19.
7ARIMOTO SADAO.Color deepening agent andmethod for color deepening processing [P].JP2002285475,2002-10-03.
