Diazo Fast Red 5BL by The Bayer Company Limited,...
Diazo Fast Red 5BL by The Bayer Company Limited, Manchester,
Diazo Fast Red 5BL by The Bayer Company Limited, Manchester, Bradford, Glasgow, London, Belfast in Great Britain & Northern Ireland. One of a collection of colour dyes in bottles from the Colour Museum in Bradford, West Yorkshire, c.1900.