High-resolution microprinting 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. 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 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.