Fitzpatrick, Cella, Harper & Scinto
Method of forming color images
 In a process for forming color images using more than one kind of color ink including black ink, the dyes in the color ink used have similar chromatographic characteristics. Preferably any difference of the Rf value of paper chromatography between any of the two dyes is not more than 0.30. 
Canon Kabushiki Kaisha
B
B41M
inventional
Masatsune Tsuyoshi Shoji Kazue Yasumasa Tomoko
Kobayashi Eida Koike Kanekiyo Yokoyama Komori