The Penetration of Light into Milk

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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 f P~slOC+H~I+~TIG UGHT