A small amount of an unidentified dark material is present as well.

Some people think it is a very wide plain of dark material.

Thus a careful choice of some dark material as background was clearly going to be necessary.

Reflecting a dark material, the image appears as a positive.

Then she reached out one hand to touch the dark material of the lamp's base.

At this time, another kind of road uniform was a solid dark blue or black material with white.

It is thought to be an immense plain of dark material.

It has a patch of very dark material located near its center.

The nature of the dark material on the floor is not known, but it may have erupted from depth.

That means the dark material remains in sunlight long enough to create a temperature difference.