I take it that you have something that you need to install a black shelf 3/4" x 12" x 14" into and you just need the shelf itself? If that is the case, I'd take the retired airman's advice and use a piece of plywood. You can get melamine-coated plywood shelving at most home stores and black is often a color they carry. It's generally coated on all four edges, so you can cut it to length (one side) and rip to width (one edge) and still have the front edge coated with the melamine. All you would need to cut it is a circular saw with an edge guide or a cheap benchtop table saw. If you have ever used a powered saw before, you could perform those two cuts and be done as cutting a small piece of sheet good to size is simple.
I would not go...