[Snautzer]

For the German LMB III (Luftmine B) sea mine, colors were used as a critical functional code for ground crews and ordnance experts to identify the mine's sensors and safety risks:
Firing Unit Identifiers
Yellow (Gelb): Marked mines with Magnetic sensors (e.g., M1, M2). These triggered when a ship's steel hull disrupted the Earth's magnetic field.
Blue (Blau): Marked mines with Acoustic sensors (e.g., A1, A2). These were hydrophones that detected the specific sound frequencies of ship propellers.
Green (Grün): Marked mines with Pressure sensors (e.g., D1, D2). These detected the dip in water pressure caused by a ship passing overhead.
Combinations: It was common to see mixed markings (e.g., Yellow + Green) indicating a "combined influence" mine that required both signatures to detonate.
Safety & Operational Markings
Red (Rot): A danger warning indicating Anti-handling devices (Zusatz-Zünder). These were booby-traps designed to detonate the mine if it was moved, opened, or lifted by Allied disposal teams.
White (Weiss): Used for technical stenciling. This included the serial number, weight (e.g., ~1000 kg), filling date, and explosive type (usually S3 or Hexanite).
Visual Appearance
Body Color: The main casing was typically painted in RLM 02 Grey or RLM 70/71 Dark Green for maritime camouflage.
Parachute: The parachute used to drop the mine was often Green or Red to aid in camouflage or recovery identification.