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Acetone dicarboxylic acid has been condensed with resorcinol at 200°. A red crystalline dye (dye I) isobtained which gives a red colour with greenish fluorescence when dissolved in alkali. A study of the constitution of dye I his been made. A new dye (dye II) has been obtained from 7-hydroxycoumarin-4-acetic acid and resorcinol, and its constitution assigned. The octa- and hexabromo compounds of dyes I and II respectively have also been prepared and studied.