Keywords: Indigo-factory Bengal4.jpg fr Chromolithograph Indigo factory Bengal 1867 from William Simpson's 'India Ancient and Modern' Bengal was the world's largest producer of indigo in the 19th century 2014-05-20 18 13 01 http //www bl uk/onlinegallery/onlineex/apac/other/largeimage66601 html William Simpson PD-Art Uploaded with UploadWizard Indigo dye |