Yes, human saliva has been (and still is ) used, as it has a very effective emzyme in it. In fact a fair amount of work has gone into creating synthetic spit as the human producer tends to run out doing a large canvas. Just remember to clear the spit with distilled water. ************************************************************************** Craig Deller The Deller Conservation Group Ltd Geneva, Illinois USA [log in to unmask] "Conservators make it last longer" http://home.aol.com/DELLERCON ************************************************************************** *