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
**************************************************************************
*