Multiple choice Which of the following is a reactive fluorescent dye ? Chlorosulphuric acid Copper(I)-thiophene-2-carboxylate Cyclohexenone Dansyl amide Reveal answer Fill a bubble to check yourself D Correct answer Explanation Dansyl amide is a reactive fluorescent dye that is used in biochemistry and chemistry to label substances with the fluorescent dansyl group. It is also produced as a side-product in the labelling of amino acids with dansyl chloride.