A security device that increases the number of design options available
for a machine testable security feature formed in part from a light
absorbing (e.g., magnetic) material, while more effectively hiding or
concealing this material, is provided. The inventive security device
achieves these results by physically separating this security feature
from a visually detectable or public security feature. Also provided by
way of this invention is a process for preparing the inventive security
device as well as a security document that employs one or more such
devices.