
Dark blue/black powder by Bayer Farbenfabriken vorm Fr. Bayer & Co., Elberfeld in Germany. One of a collection of colour dyes in bottles from the Colour Museum in Bradford, West Yorkshire, c.1900.
Dark blue/black powder by Bayer Farbenfabriken vorm Fr. Bayer & Co., Elberfeld in Germany. One of a collection of colour dyes in bottles from the Colour Museum in Bradford, West Yorkshire, c.1900.