This co-indices with discovery of synthetic Indigo Dye by German chemical company BASF. First discovered in 1878 its industrial scale production in 1897. Before its invention plant based Indigo cultivated in Bengal was the only source of blue dye. Bengali businessmen particularly had a majority stake in trade of Indigo. A notable Bengali bhadralok Dwarkanath Tagore (father of Rabindranath Tagore) had an important stake in its trade.