ABSTRACT
Two-dimensional impressions are those made on nongiving surfaces, such as tile, linoleum, or wood flooring, and also include those made on paper, plastics, doors, carpet, clothing, broken glass, countertops, etc. Thus, a large number of both porous and nonporous surfaces can be stepped on or kicked by an item of footwear. In addition, these impressions are even more varied because the shoe may contain any of a large variety of dust, dirt, soil residues, grime, oily materials, or blood. The many possible surfaces combined with the many materials that a shoe sole may acquire and later deposit make the methods of recovering and enhancing those impressions more numerous and complex.
