The invention features a galvanic particulate including a first conductive material and a second conductive material, wherein both the first conductive material and the second conductive material are exposed on the surface of the particulate, wherein the particle size of the particulate is from about 10 nanometers to about 100 micrometers, wherein the second conductive material comprises from about 0.01 percent to about 10 percent, by weight, of the total weight of the particulate, and wherein the difference of the standard potentials of the first conductive material and the second conductive material is at least about 0.2 V.