In 1835 Marstrand travelled to Germany as a
journeyman and worked for some time in
Berlin. Back in Denmark in 1837, Marstrand started working as a clerk for the police master in
Helsingør before taking over the family's bakery in Silkegade in 1839. Under his management, it commenced a large-scale production of rye bread and
hardtack and was expanded in 1850 with a
steam mill. The bakery was struck by fire in 1849 and 1856. After the last of the two fires, Marstrand sold the property in Silkegade and bought
Vodroff's Mill outside the city. When the mill was also destroyed by fire in 1865, Marstrand started a
small beer brewery which operated under the name Troels Af. After the acquisition of Aldersro Brewery in 1884, the name of the brewery was changed to A/S Marstrands Bryggerier (Marstrand's Brereries), but Marstrand had left it long before that time. ==Politics and public office==