Patent ID: 8512633

Claim:
An indicator composition, comprising: (a) at least one iodide salt, (b) at lease one binder, (c) at least one carbonate salt, at least one sulfate salt, or a mixture thereof, and (d) at least one antioxidant, comprising ascorbic acid, phenol acid, flavonoid, carotene, glutathione, tocopherol, ethylenediaminetetraacetic acid, tert-butyl hydroquinone, oxalic acid, uric acid, phytic acid, xanthone, retinol, lignan, curcumin, or a mixture of two or more thereof, wherein the indicator composition further comprises (h) at least one inhibitor present, the indicator composition provided on each of a plurality of panels on a support, wherein each panel contains a different amount of the at least one inhibitor, and the amount of the at least one inhibitor present on each panel is sufficient to prevent the iodide salt from reacting with an active ingredient in a sterilization medium until a selected threshold concentration of the active ingredient is reached or unless a selected threshold concentration of the active ingredient is present at each of the plurality of panels, a change in color of the indicator composition from a first color to a second color indicating that the active ingredient is present at a concentration in excess of the selected threshold concentration and wherein the at least one inhibitor comprises a ferrous salt, a copper salt, a cobalt salt, hydroquinone, a hydroquinone derivative, t-butyl catechol, an alkanolamine, catalase, quinine, potassium cyanide, 2,6-di-tert-butyl-p-cresol, or a mixture of two or more thereof.