Existing comment:
Steaming for Secrets
Common methods for secretly opening letters and packages are using steam or water to soften the envelope glue, and dry tactics that pull apart the flap.
This vintage steam kit is one of the oldest FBI-made tools. Agents plugged in the water-filled brass cylinder, which produced a precise steam jet. Though this technology was simple, it remains as useful today as it was in the last century.
Steaming tool, US, 1940s |