Photographic silver bromide emulsion containing some silver iodide

Claim 1

THE METHOD OF MAKING A SENSITIVE SILVER HALIDE EMULSION WHICH COMPRISES THE ADDITION OF AQUEOUS SILVER NITRATE SOLUTION TO AT LEAST AN EQUIVALENT AMOUNT OF AQUEOUS ALKALI CHLORIDE REACTS SUBAND GELATIN, WHICH ALKALI CHLORIDE REACTS SUBSTANTIALLY COMPLETELY WITH ALL OF THE SILVER TO FORM SILVER CHLORIDE, THEN ADDING AN AQUEOUS MIXTURE OF ALKALI BROMIDE AND IODIDE IN AN AMOUNT WHICH WILL COMPLETELY CONVERT SUBSTANTIALLY ALL OF THE SILVER CHLORIDE TO SILVER BROMIDE AND SILVER IODIDE SO THAT THE RESULTING EMULSION WILL CONTAIN AT LEAST APPROXIMATELY 6 PER CENT SILVER IODIDE, THE REMAINDER BEING ESSENTIALLY ALL SILVER BROMIDE,RIP ENING THE EMULSION, AND WASHING OUT AT LEAST SOME OF THE SOLUBLE SALTS AND BRINGING THE SOLUBLE HALIDE CONTENT OF THE EMULSION TO A POTASSIUM BROMIDE EQUIVALENT CONCENTRATION ABOVE 0.03 GRAM PER LITER, ALL OF THE OPERATION BEING CONDUCTED AT LESS THAN ABOUT 50* C.

Claim 2

THE METHOD OF MAKING A SENSITIVE SILVER HALIDE EMULSION WHICH COMPRISES THE ADDITION OF AQUEOUS SILVER NITRATE SOLUTION TO AT LEAST AN EQUIVALENT AMOUNT OF AQUEOUS ALKALI CHLORIDE REACTS SUBAND GELATIN, WHICH ALKALI CHLORIDE REACTS SUBSTANTIALLY COMPLETELY WITH ALL OF THE SILVER TO FORM SILVER CHLORIDE, THEN ADDING AN AQUEOUS MIXTURE OF ALKALI BROMIDE AND IODIDE IN AN AMOUNT WHICH WILL COMPLETELY CONVERT SUBSTANTIALLY ALL OF THE SILVER CHLORIDE TO SILVER BROMIDE AND SILVER IODIDE SO THAT THE RESULTING EMULSION WILL CONTAIN AT LEAST APPROXIMATELY 6 PER CENT SILVER IODIDE, THE REMAINDER BEING ESSENTIALLY ALL SILVER BROMIDE,RIP ENING THE EMULSION, AND WASHING OUT AT LEAST SOME OF THE SOLUBLE SALTS AND BRINGING THE SOLUBLE HALIDE CONTENT OF THE EMULSION TO A POTASSIUM BROMIDE EQUIVALENT CONCENTRATION ABOVE 0.03 GRAM PER LITER, ALL OF THE OPERATION BEING CONDUCTED AT LESS THAN ABOUT 50* C.