Dear Elaine, as far as I know diluted acetone should be harmless and is not smelly. It takes a while though (weeks rather than days). I have also found useful to drill the bone shafts as this facilitates the release of fat. For details ask Simon Davis as he knows all about this. Cheers, U -- Umberto Albarella Department of Archaeology University of Sheffield Northgate House West Street Sheffield S1 4ET United Kingdom Telephone: (+) 44 (0) 114 22 22 943 Fax: (+) 44 (0) 114 27 22 563 http://www.shef.ac.uk/archaeology/staff/albarella.html For Archaeologists for Global Justice (AGJ) see: http://www.shef.ac.uk/archaeology/global-justice.html "There is no way to peace. Peace IS the way".