The apparatus consists of a Duboscq colorimeter and an incandescent li ght source with suitable spectral filters and glass photometric standa rds for the measurement of absorbancy in sugar solutions. The a bsorbancy of all except very pale solutions, may be determined at 560 m}.! by using a special yellow-green filter. Solutions of high-grade sugar products having little color a re treated as a special case, and using a blue filter, measurements are made at 460 m}.!. The results obtainable are satisfactory for technical purposes. I. II. III. IV.
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Joseph F. Brewster (1936) studied this question.