Squaraine dye compounds
 Novel squaraine dyes and compositions of matter containing such dyes are disclosed . The novel squaraine dyes have an absorption maximum greater than 600 nanometers and are particularly useful in conjunction with a helium/neon (He/Ne) laser. Some of the squaraine dyes are hydrophilic and are therefore water soluble or water compatible and others of the squaraine dyes are lipophilic. 
Syntex (U.S.A.) Inc.
C C C C
C07C C07F C09B C07C
inventional inventional inventional inventional
Chiu C. Chun-Hua Thomas L. Donald John
Chang Chuang Tarnowski Berger Pease