Microstructures Using gold nanoparticle inks on a glass substrate, scientists concluded that it was possible for them to control the production of print patterns to a scale of 2 microns. After printing, the nano-particle ink suspension was heated using a gaussian laser; as it heated, the glass would expand due to the thermal conductivity of the gold nano-ink. In further experiments, they were able to fuse the nano-particles together into a tighter formation a continuous conductive line. Such experiments did not directly include font characters but could translate to such usage. See also Machine Identification Code Microdot Microfilmer Microform Microphotograph Point (typography) Preservation (library and archival science) References External links A Guide to the Literature of Photography and Related Subjects (1943) by Albert Boni Documents Archival science Film formats Storage media Money forgery Steganography Typography Packaging Security Authentication methods Engraving