Despite refrigeration, the company met with serious difficulties in keeping the wet curd in a workable condition. The problem was solved when E.A. Petersen, a German who had worked in the production of casein in Hamburg, introduced a new 'dry' process. This used casein granules instead of starting with milk or curd. The new product was registered in 1913 as 'Erinoid'.
In May 1914, Petersen was appointed Works Manager and took control of production at Lightpill. By October, the first Erinoid product appeared and became the main source of casein outside Germany. German imports ceased with the outbreak of war in July 1914.
There was a huge demand for Erinoid, especially from British button manufacturers. As a German, Petersen was classed as an alien and interned during WW I. At some point during 1914, production of Erinoid increased and the workforce at Lightpill grew from 25 to 125 employees.