A method of treating a glazed ceramic article comprises applying an antimicrobial composition on top of an outermost surface of a glazed ceramic article. The antimicrobial composition comprises an antimicrobial additive. The antimicrobial composition further comprises a carrier medium. The antimicrobial additive is selected from the group consisting of Bi2O3, ZnO, Ag2CO3, Ag2O, Zn, Bi, Ag, and a combination thereof.
