Squaraine dye
 Squaraine dyes and compositions of matter containing such dyes are disclosed. The 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
C07F C07C C07C C09B
inventional inventional inventional inventional
Chiu C. Donald Thomas L. John
Chang Berger Tarnowski Pease