120 Colours on Loose Cotton, Late 19th C. Kuttroff, Pickhardt & Co.NYC Salesman Sample

I swooned when I found this one, at an antiques shop in Columbia PA, and can't find documentation of another like it out there anywhere. It was produced by Kuttroff, Pickhardt & Co., NYC, an early American dye company, started by the German immigrant Adolf Kuttroff to commercialize chemical dyes from the French firm A. Poirrier. In 1876, the company became the American seller of the Badische Anilin und Soda Fabrik (BASF) chemical company. (In 1925, it was one of the companies that merged to form the General Dyestuff Corporation.)  believe this dates to the late 19th century or so.) Here is a glorious grid of 120 Aniline colors (artificially produced as opposed to natural dyes, which revolutionized the fashion industry) coloring pieces of loose cotton, with each sample of cotton tightly packed into its own square in the grid. The cardboard flaps opening to either side detail the dyes used to produce each color. The opposite side of those printed flaps provide detailed instuction on