Cassella Farbwerke Mainkur Aktiengesellschaft was a German chemicals company with headquarters in Offenbach near Frankfurt am Main. The company had its origins in a spice store founded in 1798 by Leopold Cassella. Later the company traded with dye. In 1870 a dye factory was founded. In 1925 Cassella merged into the new IG Farben. After World War II the company was reestablished as Cassella Farbwerke Mainkur AG and was acquired by Hoechst AG in 1969.