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Azo dyes (a class of organic compounds connected with aryl groups at both ends of azo group) are the most widely used synthetic dyes in textile and clothing printing and dyeing process, used in a variety of natural and synthetic fiber dyeing and printing, also used in paint, plastic, rubber, etc.
There are three methods for testing azo: thin layer chromatography (TLC), gas chromatography and mass spectrometry (GC-MSD) and high performance liquid chromatography (HPLC).