Squaraine dyes
 Squaraine dyes and compositions of matter containing such dyes are disclosed. The squaraine dyes have an absorption maximum greater than 600 nanometers and are particulary 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 C09B C07C C07C
inventional inventional inventional inventional
Chun-Hua Chiu C. Donald Thomas L. John
Chuang Chang Berger Tarnowski Pease