Indicator for monitoring vapor sterilization, especially using formaldehyde, containing chromotropic acid disodium salt dihydrate to form permanent violet color when sterilization is complete

摘要

A chemical indicator for controlling vapor sterilization comprises an aqueous solution of chromotropic acid disodium salt dihydrate (I), to which gelatin or powdered adhesive has been added. A chemical indicator for controlling the sterilization of an article by contacting with vapor (preferably formaldehyde-water vapor) comprises a carrier supporting an indicator giving at least one color change as a result of chemical reactions during sterilization, to indicate the phase of the sterilization process taking place. The novel feature is that the indicator comprises an aqueous solution of chromotropic acid disodium salt dihydrate (I), to which gelatin or powdered adhesive has been added.