 It was decided to transform the large stable building in the courtyard into a dedicated chemical laboratory.When the Polytechnic College was eventually founded in 1829, Zeise was instrumental in getting the chemical laboratory expanded and organised.In 1823 while still in the small laboratory at Nørregade he identified a new family of sulfur-containing compounds, calling them xanthates (xanthus, Greek "yellow") on account of the predominantly yellow colour of xanthate salts.