Abstract

Color is a factor of primary importance in the market value of raw tomatoes. J. N. Yeatman, A. P. Sidwell, and K. N. Norris [ Food Technol. 14, 16 ( 1960)] have developed an equation for color quality of raw tomatoes using purées of fresh fruit as specimens. The U. S. Department of Agriculture asked Hunter Associates Laboratory to design a photoelectric tristimulus instrument to measure this quality index directly. This has been done by modifying the Ohm’s law analog scales of the Hunter color difference meter [see R. S. Hunter, J. Opt. Soc. Am. 48, 985 ( 1958)] to solve the tomato-color equation in four steps.

© 1961 Optical Society of America

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