The present invention relates to a method for characterizing defects on silicon surfaces, such as silicon wafers, a method for treating silicon surfaces with an etching solution, and an etching solution to be employed in the treating and defect characterization of such silicon wafer surfaces. One or more cold plate elements surround each pole and are in substantial contact therewith. The postcard generator receives a supply of print media and prints, using an in-built printer, a postcard having a printed image on one side and the postcard format on the other side. These antitoxins are useful in the treatment of humans and other animals intoxicated with at least one bacterial toxin. The wear pad preferably extends from a point proximate the second end of the base portion toward the first end of the base portion to a location proximate the mount.