Hi Allan,
I'm also a foreigner, but as far as I'm concerned, dead color is a color which has no gloss upon it. Artists like Rembrandt used to apply a layer of dead color on the canvas and then paint on it, it was a dark toned paint. If you visit
www.angelartschool.com/secret.htm secret.htm you will see an example of painting with Caravaggio's technique with the dead color.
Body color is a paint or pigment that has consistency, thickness, or body, in distinction from a tint or wash.
Hope it helps buddy.