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The Penetration of Light into Milk¹

Department of Dairy Industry, Cornell University, Ithaca, New York

ABSTRACT

It has long been known that light causes changes in milk. However, there is no reliable information on how far light penetrates into milk. To secure such information, the amount of light transmitted by layers of milk of increasing thickness was determined. Care was taken to measure all of the light transmitted, both the scattered and undeviated rays, since both are capable of producing chemical changes.

APPARATUS AND PROCEDURE

A schematic diagram of the light transmission apparatus is shown in Figure 1. The apparatus consisted essentially of a hollow sphere coated on the inside with magnesium oxide, a multiplier photometer, and an absorption cell. Virtually all of the light transmitted by the milk was trapped in the sphere, and its intensity was measured by the photometer. The photometer (model 520M, Photo-volt Corp., New York) was equipped with a 28-B photomultiplier tube. Monochromatic light of high purity was produced by passing the rays from a General Electric AH-4 mercury arc through a Bausch and Lomb 250-mm. concave grating monochrometer.

¹ Some of the data appearing in this paper were taken from a thesis presented by the senior author to the faculty of the Graduate School of Cornell University in partial fulfillment of the requirement for the degree of Doctor of Philosophy, February, 1954.

² Present address: Dept. of Chemical Engineering, University of Toronto, Toronto, Ontario.