| abstract |
An optical information recording medium being capable of effecting recording and regeneration by using laser beam which comprises a transparent or opaque substrate and a thin film recording layer, formed on said substrate, said recording layer containing a cyanine coloring matter represented by the following formula:n n(wherein, R 1 , R 2 and R 3 may be the same or different, each of them stands for an alkyl group having 1 - 6 carbon atoms, X stands for halogen, and Z stands for a superhalogenic ion, a paratoluene sulfonic ion or an alkylsulfuric ion). |