These allowed BEP to print currency by the dry intaglio process, 32 notes to the sheet.
Vitreography was initially conceived of as an intaglio process, in which line and tone are carved, engraved or etched into the glass plate's surface.
His was the first independent American workshop developed for exclusive experimentation of the intaglio process of printmaking.
The issue was engraved by the intaglio process, printed in red-brown by the Banknote Corporation of America.
Since 1968, all currency has been printed by means of the dry intaglio process, whereby wetting of the paper prior to printing is unnecessary.
While counterfeits made using the intaglio process had been seen on rare occasions before, this note surpassed all of them in the quality of the engraving.
In the early 1850s he suggested using "photographic screens or veils" in connection with a photographic intaglio process.
The very sharp printing obtained from the intaglio process is hard to imitate by other means.
Metal plates, usually copper or zinc, are used, as in the intaglio processes.
However high-pressure web intaglio printing, front and back of the intaglio process, was a totally new idea.