Aurin Aurin , sometimes named rosolic acid or corallin is an organic compound , forming yellowish or deep-red crystals with greenish metallic luster . It is practically insoluble in water, freely soluble in alcohol . It is soluble in strong acids to form yellow solution, or in aqueous alkalis to form carmine red solutions . Due to this behaviour it can be used as pH indicator with pH transition range 5.0 - 6.8. It is used as an intermediate in manufacturing of dyes.Synthesis Aurin was first prepared in 1834 by the German chemist Friedlieb Ferdinand Runge , who obtained it by distilling coal tar . He named it Rosölsäure or Rosaölsäure . In 1861, the German chemists Hermann Kolbe and Rudolf Schmitt presented the synthesis of aurin by heating oxalic acid and creosote in the presence of concentrated sulfuric acid . phenol and oxalic acid in concentrated sulfuric acid.Safety Causes eye, skin, and respiratory tract irritation . Avoid ingestion and/ or inhalation .
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