Correct Answer and Feedback
Because a television camera distinguishes gray tones only, using
a color with the same tone as the background color tone hides the
graphic from the camera. Using the same color tone allows the
person in the studio with the graphic to see the graphic on the
background, but the camera does not show the graphic to the
All the viewer sees on the screen is the blank
background (page 34, para 6h(4)).
You use the colors black or blue for the symbols that indicate
friendly forces, installations, and posts; whereas the same
symbols drawn in red indicates enemy forces, installations, and
posts. You would use green lines for the symbol of any man-made
obstacles. To further identify the obstacle as created by the
enemy, you add the abbreviation EN (page 50, para 10b(2)).