It was decided that the Bureau of Printing and Engraving would have a fine metallic strip running through the currency, leaving the basic design intact; however, they later decided to use a clear imprinted polyester strip, woven into the paper, running vertically on the left side of the Federal Reserve Seal.
dollar bills." The variations shown, consisted of each denomination being a different color; Federal Reserve seals replaced with a design utilizing reflective ink; and other optical devices like holograms (a process which produces a three-dimensional image which can change color depending on the angle it is viewed), and multilayer diffraction gratings (similar to a hologram); as well as bills containing metal security threads, and planchettes (red and blue colored discs incorporated into the paper, similar to threads) to trigger scanning equipment which would detect its presence, and to sort cash faster.
The begins engraving and printing the faces and seals of U.S. banknotes. Before this, U.S. banknotes were produced by private banknote companies and then sent to the Bureau of Engraving and Printing for sealing, trimming, and cutting.