Watermarks are made by applying different degrees of pressure during the paper manufacturing process. Most watermarks make subtle designs on the front and back of the checks. These marks are not easily visible and can only be seen when they are held up to light at a 45-degree angle. This offers protection from counterfeiting because copiers and scanners generally cannot accurately copy watermarks. Copy Void Pantograph .
Pantographs are patented designs in the background pattern of checks.
Chemical Voids . Chemical voids involve treating check paper in a manner that is not detectable until eradicator chemicals contact the paper. Checks treated with chemical voids cannot be altered without detection. High-Resolution Micro Printing . High-resolution micro printing is very small printing, typically used for the signature line of a check or around the border in what appears to be a line or pattern to the naked eye.