A pharmaceutically acceptable, edible ink for use on gelatin capsules, tablets, and the like which consists essentially of about 5-20 parts by weight of a liquid dye, about 0.5-3 parts by weight of hydroxypropyl cellulose, hydroxypropyl methyl cellulose or a combination of both, about 2-10 parts by weight of alcohol, about 0.001-1 part by weight of a surface active agent, and sufficient water to make 100 parts, all these components being of pharmaceutical grade. U.S. Patent 3475187
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