Introduction of his son Christian Barthel (Senior) to the company, who in 1911 became joint owner.
When his father retired from the company, Christian Barthel (Senior) became the sole owner
A new coloured paper factory was built and alot of money was invested in modern equipment. As the company expanded the coloured paper company Ludwig Bähr was transformed into a partnership limited by shares. With a team of about 90 employees, production was continued mainly for the main export countries England and France and Bähr products even managed to reach China through exporters in Hamburg.
Hugo Schweitzer, the brother-in-law of Christian Barthel (Senior) joins the company and establishes a market within Germany with a list of sales distributors throughout the country. The Buntpapierfabrik Ludwig Bähr brings coloured poster cardboard onto the market for the first time. At that time this was a complete innovation and a long-lasting success for the booming advertising market. In addition, glacé, glossy, chromo, gold and silver paper and oatmeal paper were all produced and sold in large quantities.