 In 1757 additional craftsmen were hired from Meissen porcelain and in 1759 Hannong was able to open a shop in Strasbourg.However, in 1760 Karl Hannong died and the business became the property of his two sons Joseph Adam Hannong and Peter Anton Hannong, who fell out over the "arcanum" (the formula of the paste).Their disagreements had a damaging effect on the business and by 1761 they had borrowed so much from the Elector that it was impossible for them to repay it.