Charles Wysocky of the Altoona Police Department worked a burglary
and found a piece of Styrofoam that the suspect had stepped
on. On the surface of the Styrofoam there was a shoe impression.
documenting the impression in the Styrofoam with photography
and not knowing how long the impression would remain in the
Styrofoam before it raised and possibly vanish.
had an Extruder gun with Polyviynlsiloxane and decided to try
a lift of the impression in the Styrofoam using the Polyviynlsiloxane.
By dispensing the Polyviynlsiloxane on the impression, then
spreading it out with a spatula to cover the area. What resulted
was a casting of the shoe print impression.