Prolonged skin contact with antimony dust may cause dermatitis . However , it was agreed at the European Union level that the skin rashes observed are not substance @-@ specific , but most probably due to a physical blocking of sweat ducts ( ECHA / PR / 09 / 09 , Helsinki , 6 July 2009 ) . Antimony dust may also be explosive when dispersed in the air ; when in a bulk solid it is not combustible .