These bags filled with that dangerous substance are an art installation at the Wagenhallen (train wagon halls) in Stuttgart - an abandoned industrial area, where artists use the things they find there to create arbitrary sculptures and installations. A great place that has been used by quite some great photographers as background scene for professional fashion photo shootings.
Drink and Click @ Motorworld, June 2016 Challenge: Car Details (Mercedes Benz 300Se, 1967)
Porsche 356 Carrera 2
Porsche 356 Carrera 2 Cabriolet, 1962, Porsche Museum in Zuffenhausen, Stuttgart