A pale form, ground color essentially whitish with faint buff tinge above; black underside barring variable from indistinct to pronounced.

But how time and events twisted that bond to show its black underside.

I hunt through my cabinets and turn up the black shiny underside of a decorative box.

The airplane is dark gray on top with black undersides.

It has a black underside.

Most were painted with white upper-surfaces and black undersides with a low demarcation between the colours.

As it did, ships lifted from the Ringworld's black underside.

The Hindmost fired a laser at the Ringworld's black underside.

The sunfish ship followed the thread of a spillpipe beneath the Ringworld's black underside.

Light thrust forward in twin spears to fall across the black underside of the Ringworld.