Dark matter is so named because it does not interact electromagnetically and thus isn't observed directly with visible light; yet possesses mass. Dark matter is significant to cosmology due to unsolved questions arising from observations about the apparent mass of the universe. Several candidates have been proposed for the makeup of dark matter including near-massless subatomnic particles such as neutrinos.
The term 'black material' by contrast would imply something far more mundane, the simple property of matter wherein its surface would tend to absorb a significant fraction of incident light and thus have a black appearance to an observer.
The material formed is Carbon.
basalt
creosote
The material sucked in to a black hole becomes part of the black hole - that is, a black hole crushes matter to an nearly no size, at all.
A dark material that will absorb, and then transfer, the subsequent heat build-up of the material. Black material, such as cotton, would work excellently.
The material formed is Carbon.
Carbon
asphalt
Not all Piccolo's are black, it depends on what material is used to make the instrument.
Carbon
Black.
Black
basalt
You would want to start out at a sewing and craft store by getting a pattern so that you will know how much material that you will need. You will need black material for the outfit and silky black material for the hood. You will also want black thread and something to use for embellishments on the costume.
creosote
Leather and plastic
Carbon deposits