Color reaction of thyroxine and its derivatives with nitrous acid.
D055598:Chemical Phenomena; D002621:Chemistry; D002855:Chromatography, Thin Layer; D003124:Colorimetry; D006863:Hydrogen-Ion Concentration; D007259:Infrared Rays; D009573:Nitrites; D013057:Spectrum Analysis; D013974:Thyroxine; D014466:Ultraviolet Rays
D009573:Nitrites; D013974:Thyroxine