Trona Red 3B (By) by Farbenfabriken vorm Fr. Bayer & Co....
Trona Red 3B (By) by Farbenfabriken vorm Fr. Bayer & Co. Elb
Trona Red 3B (By) by Farbenfabriken vorm Fr. Bayer & Co. Elberfeld, Manufactured in Germany. One of a collection of colour dyes in bottles from the Colour Museum in Bradford, West Yorkshire, c.1900.