Abstract
The purpose of the present paper is to report a study of this new reaction described by Rosenthal and Erdelyi. An attempt will be made (a) to determine what effect, if any, the presence of the polyphenol has in the reaction mixture wherein a color is developed when vitamin A or carotene is treated with antimony trichloride; and (b) to determine, if possible, whether this reaction is due to vitamin A or to certain unsaturated fatty acids, fatty acid esters, or other substances found in oils.