Figure 1 is a low magnification (50X) SEM micrograph of activated carbon particles of an air filter. Activated carbon is similar to graphitic carbon except that it has a high degree of porosity and a large internal surface area. Activated carbon is mostly used as a filter material for removing impurities from water and various gases. Figure 2 is a moderately magnified (1000X) SEM micrograph (of the particle to the right in Figure 1) indicating internal surfaces and porosity in the activated carbon. This sample was sufficiently conductive that it was not coated. The small bright areas on the surface are non-carbon and non-conductive materials.