REACTIONS AND IDENTIFICATION 353 3. Phthalein formation.* Fuse together carefully in a dry test-tube a few crystals of salicylic acid or of a salicylate with an equal quantity of phthalic anhydride moistened with 2 drops of cone. H 8 SO 4 . Cool, dissolve in water and add NaOH solution in excess: a bright red coloration is developed. Phthalic acid. C 6 H 4 (COOH) 2 . 1. Phthalein reaction. Fuse together carefully in a dry test-tube a few crystals of phthalic acid or of a phthalate and an equal quantity of phenol moistened with 2 drops of cone. H 2 SO 4 . Cool, dissolve in water and add NaOH solution in excess: the bright red colour of phenolphthalein in alkaline solution is produced. 2. Fluorescein reaction.^ Repeat Test i, using however resorcinol instead of phenol. A reddish solution having an intense green fluores-cence is produced. Cinnamic acid. C 6 H 6 CHiCHCOOH. 1. Oxidation, (a) Unsaturation test. Dissolve about 0*1 g. of cinna-mic acid or of a soluble cinnamate in about 5 ml. of 10% Na
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