Physicochemical properties of formalized proteins were studied. Decline of hydrogen ion concentration of formalized proteins was noticed in the high concentrations of formalin, while incline in the low concentrations. Colorization of formalized proteins, caused by Folin's phenol reagent, was depressed with increase of concentration of formalin. There was found increased turbidity of formalized proteins with increase of concentration of formalin. On paper electrophoresis marked changes were observed in the higher concentrations of formalin, while in the lower concentrations, slight changes were noticed compared with the controls.