Uploaded December 2025 | Updated September 2026, 2 weeks ago

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In this video, we uncover the real reason you sometimes find black fingerprint dust around your door lock. Many people think it’s dirt, grease, or the lock wearing out—but in most cases, it’s actually leftover fingerprint powder from police or forensic investigations.

I’ll explain why this dust appears, how it ends up around the lock area, and what it means for the door and hardware. You’ll also see how we identify it, how to clean it properly, and why it sticks around long after the police have gone.

If you’ve ever walked up to a door and wondered why there’s strange black powder near the handle or lock, this video reveals the surprising truth.

Links:
Dr Lock Shop – https://www.drlock.com.au

Locksmith Parramatta – https://www.drlock.com.au/locksmith/parramatta

Locksmith Sydney – https://www.drlock.com.au/locksmith/sydney


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