A color reaction of AsA^<*2)> viz DAsA^<*1)> with pyrrole was examined about the specificity and the reaction mechanism. It was reported in the previous paper that this reaction was specific to tricarbonyl compounds. However, it was found that some diketo- compounds such as isatin, glyoxal developed a blue color. On the other hand, it was known that some five-membered heterocyclic compounds such as furan, thiophen and pyrrolidine revealed no blue color, when they were used as the substitute of pyrrole. Pyrrole having a substituents at 2-position or at 2,5-positions produced no blue material in the reaction, but 3,4-dimethylpyrrole or 2,2'-bipyrrole developed the color with DAsA. As the results, it was presumed that DAsA reacted with two moles of pyrrole or with one mole of 2,2'-bipyrrole to produce a blue dye, the chemical structure of which resembled to indophenine. The study is now going on and the result will be reported in the future.