Radiation-sensitive emulsions and elements and their preparation

Claim 1

A PROCESS FOR MAKING LIGHT-DEVELOPABLE, DIRECTWRITING COLLOID-SILVER HALIDE EMULSION CHARACTERIZED BY ADDING TO THE LIQUIFIED, WASHED COLLOID-SILVER HALIDE EMULSION HAVING AN AVERAGE SILVER HALIDE GRAIN SIZE IN THE RANGE OF 0.1 TO 10 MICRONS, AN OPTICAL SENSITIZING DYE SELECTED FROM THE GROUP CONSISTING OF CYANINE, PSEUDOCYANINE, CARBOCYANINE AND MEROCYANINE DYES CAPABLE OF EXTENDING THE SENSITIVITY OF A SILVER BROMIDE EMULSION FROM THE NORMAL BLUE REGION TO AT LEAST ONE OF THE GREEN, RED AND INFRARED REGIONS OF THE SPECTRUM, MAINTAINING THE EMULSION AT A TEMPERATURE OF FROM 50*C. TO 70*C. FOR A PERIOD OF ABOUT 5 MINUTES TO ABOUT 20 MINUTES SO THAT THE DYE IS THOROUGHLY MIXED AND STRONGLY ADSORBED TO THE SILVER HALIDE GRAINS, THEN ADDING ABOUT 0.1 TO 120 MOLE PERCENT OF A WATER-SOLUBLE STANNOUS SALT PER MOLE OF SILVER HALIDE AND A WATER-SOLUBLE HALIDE.