... indicated above. Luteic acid forms reddish needles which are decomposed, with evolution of gas, at 338-341 C. Heated with 10 per cent. caustic soda solution it yields ellagic acid. In pyridine solution the carboxyl group maybe eliminated by hydrogen iodide, whereby pentoxybiphenylmethylolide is formed as long silky needles, which do not melt below 300 C. The same substance may also be obtained when ellagic acid is boiled with concentrated caustic potash solution. When ... — Synthetic Tannins • Georg Grasser
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