硫酸マグネシウム
In 1867 the company incurred financial losses from a bad investment in the United Kingdom and declining demand for its products. In the same year Julius Vorster Jr., the son of the founder Julius Vorster, became involved in the management of the company. On his recommendation the company began to produce magnesium sulfate in order to reduce the losses. Magnesium sulfate was primarily intended for the export to the United Kingdom, where it was used as a drying agent in the textile industry. The new product and an improving market for potassium nitrate helped the company to overcome the financial crisis in 1870. In 1871 the potassium chloride factory in Staßfurt was closed. On 1 October 1875 the second son of Vorster, the chemist Fritz Vorster joined the company as technical director. After the death of the founder Julius Vorster on 10 October 1876, the new owners converted the company into a limited partnership ("Kommanditgesellschaft").