I seem to recall urine can be part of an explosive mixture (ammonia or would it be urea?), but then so can compressed sugar or custard powder (one General Foods facility in the UK lost a large section of wall due to compressed custard powder exploding in the 1980's. The custard was definitely for the Birds). Colin -- cdb, colin@btech-online.co.uk on 12/14/2009 Web presence: www.btech-online.co.uk Hosted by: www.1and1.co.uk/?k_id=7988359 -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist