Disclosed is a method for inhibiting the growth of mold on building materials by application onto andor incorporation into the building material of a mold-inhibiting composition comprising dehydroacetic acid or a salt thereof and, optionally, an additional fungicidal agent such as a quaternary ammonium compound. The signal detector includes a first detector to generate raw decisions as a function of the read back signal. The captured image is divided into M pixel blocks having N\xd7N pixels. The digital receipt includes information indicative of the financial transaction. The SN either prompts the user to provide the phone number of the mobile device via an IVRU or through a web-based form sent to a web server connected to the SN.