Abstract: It is an object of the present invention to provide a fluorescence imaging probe capable of selectively visualizing target cells such as cells expressing ?-galactosidase (lacZ expressing cells) at a single-cell level in a red fluorescence region, and of performing co-staining together with GFP.

Abstract: It is an object of the present invention to provide a fluorescence imaging probe capable of selectively visualizing target cells such as cells expressing ?-galactosidase (lacZ expressing cells) at a single-cell level in a red fluorescence region, and of performing co-staining together with GFP.

Abstract: At first step S1, a passivation film is removed by performing pickling on a separator for fuel cell and then a new passivation film is formed b performing heating at 200-280° preferably. At second step S2, mechanical polishing is performed on the horizontal top surfaces in the waiving portion of the separator for fuel cell, and a chipped portion is provided by chipping off a part of the passivation film. At third step S3, the separator for fuel cell is plated to form a first plating film composed of gold, rhodium, platinum or an alloy of two or more kinds of them starting at the periphery of the chipped portion. A complex ion stabilizer for suppressing dissociation of complex ions is added to plating bath.