Acetate

Claim 1

THE COLOR SEPARATION METHOD THAT COMPRISES SUPERIMPOSING A PHOTOGRAPHIC NEGATIVE OF AN ORIGINAL SUBJECT OVER A DIAZO SENSITIZED FILM, EXPOSING THE ASSEMBLAGE TO ACTINIC LIGHT AND DEVELOPING BY AMMONIA DEVELOPMENT A POSITIVE KEY TRANSPARENCY ON SAID FILM, PREPARING FROM SAID POSITIVE KEY TRANSPARENCY A COMPOSITE COLOR SEPARATION FOR EACH COLOR DESIRED BY A SEQUENCE OF STEPS INVOLVING FOR EACH COLOR: (1) ARRANGING SAID POSITIVE TRANSPARENCY ON MECHANICAL ALIGNING MEANS, (2) SUPERIMPOSING THEREON, ENGAGED WITH SAID ALIGNMENT MEANS, A SHEET OF CLEAT TRANSPARENT FILM, (3) APPLYING TO SAID CLEAR FILM OVER AREAS OF THE POSITIVE TRANSPARENCY WHICH ARE TO BE OF LIKE INTENSITY OF THE PARTICULAR COLOR, VISIBLE DEPOSITS OF A DIAZO SENSITIZING AGENT WHICH IS INACTIVATED BY ACTINIC LIGHT AND ADAPTED UPON AMMONIA DEVELOPING TO FORM A FIXED IMAGE OPAQUE TO ACTINIC LIGHT, (4) REMOVING SAID FILM FROM THE REGISTERING MEANS AND ASSEMBLING THE SAME IN PROPER ANGULAR ALIGNMENT WITH A SCREEN, OPQUE TO ACTINIC LIGHT AND CORRESPONDING WITH THE INTENSITY OF COLOR DESIRED, (5) EXPOSING THIS ASSEMBLAGE TO ACTINIC LIGHT, (6) PASSING THE FILM THUS EXPOSED TO AN AMMONIA DEVELOPER TO THEREBY FIX A POSITIVE IMAGE FOR THE COLOR IN THE DESIRED INTENSITY, AND REPREATING THE SEQUENCE OF STEPS 2 TO 6 WITH THE SAME CLEAR FILM FOR EACH DIFFERENT INTENSITY OF THE PARTICULAR COLOR REQUIRED IN SAID COMPOSITION COLOR SEPARATION, ELIMINATING IN THE CASE OF 100% COLOR STEPS 4 AND 5 ABOVE, SAID COMPOSITE COLOR SEPARATION BEING ADAPTED FOR DIRECT USE BY AN ENGRAVER IN MAKING A COLOR PRINTING PLATE FOR PRINTING PROCESSES IN WHICH INK IS CARRIED BY DEPRESSIONS IN THE PLATE, AND INDIRECTLY THROUGH TRANSFER TO REVERSAL DIAZO SENSITIZED FILM IN MAKING A COLOR PRINTING PLAYE FOR PRINTING PROCESSES IN WHICH INK IS CARRIED BY THE FACE OF THE PLATE.