When magnified, the line or pattern contains a series of words that run together or become totally illegible if the check has been photocopied or scanned with a desktop scanner. Three-dimensional Reflective Holostripe . A holostripe is a metallic stripe that contains one or more holograms, similar to those on credit cards. These items are difficult to forge, scan, or reproduce because they are produced by a sophisticated, laser-based etching process. Security Inks. .
Security inks react with common eradication chemicals.
These inks reduce a forger's ability to modify the printed dollar amount or alter the designated payee because when solvents are applied, a chemical reaction with the security ink distorts the appearance of the check. This makes such items very difficult to alter without detection. The chemical reactants produce permanent stains when bleach or solvents are used to alter the check document. Embedded in the sheet, fibers are visible only under ultraviolet light, and are extremely difficult to duplicate. Fibers are visible in ordinary light and arranged on both sides of the check.