Hypersensitization gains in the near infrared

The hypersensitixation of the Kodak I-N emulsion with baths of plain water, triethanolamine, and ammonia was studied as part of a project aimed at increasing the effectiveness of objective prism detection of faint, cool stars. These agents were found to produce exposure gains of 2.1, 3.3, and 4.0, respectively, in the attainment of photographic density 0.6. The results apply to the spectral range of 6800 to 8800 A. They are valid for typical astronomical exposure times of 20 minutes to one hour.