A corrosion-indicating material and methods of producing and using the corrosion-indicating material are provided. The corrosion-indicating material comprises a cured product of reacting a bisphenol A diglycidyl ether epoxy (DGEBA) resin with a curing agent, the curing agent comprising a 1,10-phenanthroline derivative having formula (I): where: R1 and R2 are independently selected from —NH2; —NH(CH2)aNH2, where a is 1, 2, or 3; —OC(═O)(CH2)bNH2, where b is 1, 2, or 3; and —H; R3 and R4 are either: non-joined monovalent radicals each independently chosen from —H, —NH2, and (C1-C20)heterohydrocarbyls comprising at least one primary amine or at least one secondary amine; or joined as a single divalent radical, the single divalent radical being a (C1-C40)heterohydrocarbyl comprising at least one primary amine or at least one secondary amine; and at least one of R1, R2, R3, and R4 is not —H.