Allen
A little late responding .... but,
The British I believe use the term 'body color' when referring to opaque watercolor or gauche especially as in a stroke of body color on top of a transparent watercolor as occasionally Sargent would do in order to not paint around very small touches of light value surrounded by dark. A more satisfactory and fresh approach than the purist idea of straight transparency or 'lifting' which can often look overworked.
'Dead color' I would think would refer to the dead layer of a multi-layered painting method in which a gray opaque layer is painted upon a transparent massing in of a line drawing on canvas. When the dead layer is dry, the transparent and opaque color layers begin and so forth until finished.
I hope you don't mind me chiming in a couple of years after the fact but I just recently been active.
Clayton
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