ABSTRACT
Examine the item you receive for obvious tool marks and foreign or unusual marks. 2. Document and photograph the questioned marks. Figure 19.1 shows suspected tool marks on
a mortise lock. 3. Examine the questioned marks
in situ
under oblique lighting. 4. Prepare casting silicone according to the manufacturer’s instruction (Figure 19.2). 5. Apply casting silicone to the questioned marks (Figure 19.3). 6. Allow the silicone to set about 15 minutes and photograph it. 7. Remove the silicone cast for examination (Figure 19.4) and comparison with known tools.
