Drywall grey, like a freshly made cast, not yet sanded smooth.
Plaster Cast is a light grey, close to white.
It can be described as light, pale, neutral and almost grey.
Set in black, because black reads best on it.
A plaster cast is a copy made in plaster of another 3-dimensional form. The original from which the cast is taken may be a sculpture, building, a face, a pregnant belly, a fossil or other remains such as fresh or fossilised footprints – particularly in palaeontology.
Read on WikipediaPlaster is a building material typically used for cladding on interior walls, pool interiors, ceilings and for moulding and casting decorative elements. In English, "plaster" usually means a material used for the interiors of buildings, while "render" commonly refers to external applications. The term stucco refers to a physically different mixture commonly used for exterior building wall cladding.
Read on WikipediaNoun