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The small miracle of printing a design in multiplecolors from a single plate with a single impression isachieved from a very simple principle. The plate itselfis inked in as many colors as may be desired. Each colorbeing applied to only that portion of the plate whichis required to print that color. In other words the inkrollers are themselves printing plates which "print" theirink onto the plate which in turn will do the actual print-ing on paper. Hence, if two colors are desired two print-ing rolls are required, one for each color, each so de-signed as to pass ink to only certain portions of theprinting plate. If three colors are wanted then three inkrollers are provided. Theoretically, at least, there is nolimit to the number of colors that could be thus printedat a single impression. |
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