material.
Could It Be a Mark Left by a Locksmith?
Absolutely.
Locks and doors can accumulate all sorts of little traces during installation, repair, inspection, or maintenance.
A locksmith or contractor might use:
- Marking compounds
- Sealants
- Adhesives
- Lubricants
- Paint
- Wax-like materials
If the lock has recently been repaired or replaced, that history is one of the first things I’d investigate.
And if the red material looks neat and intentional and is positioned around a screw, seam, or component rather than randomly smeared across the door, that can be a useful
