A security feature and method for verifying the authenticity of commercial paper. In one embodiment, pearlescent ink is added to a portion of commercial paper stock. A recipient can then tilt the commercial paper stock to view the pearlescent ink mark, design, or spot from different angles, causing the...http://www.google.com/patents/US7384890?utm_source=gb-gplus-sharePatent US7384890 - Check fraud protection techniques
