According to Griess reaction, diazonium-salts formed from aromatic amines such as sulfonamides etc., react with NaNO_2 in acid medium and may be coupled with α-naphthylamine or diphenylamine to produce red colored compounds.

一按Griess反應芳香族胺類的重氮化鹽农村片人人操，如對氨基苯磺醯胺類藥物等a级线手机免费观看，在酸性溶液中皆能與α-萘胺或二苯胺分別偶合成偶氮色素而顯紅色，過多之亞硝酸可與氮色素再作用使紅色消失而呈棕黃色国产一级A特黄AAA片。