Paper Yellow W (L) by A. Leonhardt & Co., Farbwerk...
Paper Yellow W (L) by A. Leonhardt & Co., Farbwerk Muhlheim,
Paper Yellow W (L) by A. Leonhardt & Co., Farbwerk Muhlheim, Muhlheim a/Main in Germany. One of a collection of colour dyes in bottles from the Colour Museum in Bradford, West Yorkshire, c.1900.