Naphtogen-Reinblau 3B by Actien Gesellschaft fur Anilin...
Naphtogen-Reinblau 3B by Actien Gesellschaft fur Anilin Fabr
Naphtogen-Reinblau 3B by Actien Gesellschaft fur Anilin Fabrikation, Berlin in Germany. One of a collection of colour dyes in bottles from the Colour Museum in Bradford, West Yorkshire, c.1900.