Robert 'Bob' Berdella, owner of Bob's Bizarre Bazaar in the Westport Flea Market, Kansas City, Missouri was a serial killer dubbed "The Kansas City Butcher" and "The Collector". Kidnapped, tortured, raped and dismembered at least six men between 1984 and 1987.
 
This looks like the window sill from the bedroom window which would have been used by Chris Bryson when he escaped. The window sill is clearly discolored. Not sure of the substance.
Includes the original evidence bag. 
Obtained from the Del Dunmire estate in Harrisonville, MO.
 
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