Abstract: A novel set of basic printing inks for producing improved color tones in multicolor printing comprising four individual inks of golden-yellow, carmin, violet, and turquoise hues, respectively, and having predetermined spectral intervals between their maximum density wavelengths, the maximum density of each of the intermediate pair of colors being substantially equidistant from the middle of the visible color spectrum.

Abstract: A method and apparatus for reproducing black and white and color copy having improved contrast of highlight and shadow areas of the copy by recording an optically-produced main image on a light-sensitive emulsion, directing the light emanating therefrom via television camera and electronically inverting the same and sending this signal through a video monitor having contrast and brightness control, and projecting the secondary negative image therefrom onto the light-sensitive emulsion in register with the main positive image.