Abstract
A WELL-FILTERED coloured sugar solution (in water) has an extinction-curve falling with increasing wave-length of light from near ultra-violet to red. Using as reference a clear, colourless sugar solution of the same concentration as the sample, it is possible to extend the observations in the range of near infrared without interference from the strong absorption bands of water at about 980 and 1,175 mµ. The extinction of the coloured sample will then show a continuous decrease with increasing wave-length up to a range of 1,000–1,100 mµ, where a flat minimum occurs. At still longer wave-lengths, the extinction rises again. The minimum extinction is very low compared with the optical density for visible light.
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BIRCH-IENSEN, Å. Transmission of Infra-red Light in Turbid and Clear Sugar Solutions. Nature 178, 428 (1956). https://doi.org/10.1038/178428a0
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DOI: https://doi.org/10.1038/178428a0
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