Patent ID: 8222327

Claim:
An indicator for plasma sterilization comprising: a) an azo dye represented by the general formula: X—N═N—Y, wherein X represents a residue of heterocyclic ring selected from the group consisting of triazole ring, benzothiazole ring, thiadiazole ring, triazole ring, pyridine ring, and quinoline ring, wherein the residue of heterocyclic ring may further optionally include a non-dissociated group as a substituent therein, and Y represents a residue of aniline derivative of which p-site is capable of coupling to a neighboring N atom, wherein the residue of aniline derivative may further optionally include a non-dissociated group as a substituent therein; b) a compound containing a mercapto group or a dithiocarbamyl group therein; and c) a resin as binder, wherein the binder is at least one or more members selected from the group consisting of phenoxy resins, amorphous copolyester resins, polyester-polyurethane resins, and cyclohexanone type polyketone resins.