The aldehydes in reducing sugars will reduce silver ion from Tollen's reagent to metallic silver, leaving a reflective mirror on the inside of a flask.

Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, AB T6G 2R3, Canada Li Ka Shing Institute of Virology, University of Alberta, Edmonton, AB T6G 2E1, Canada Department ...

School of Materials and Chemical Engineering, Ningbo University of Technology, Ningbo 315211, P.R. China ...