Recently Spectrum Noir released products, Metallic Pencils and Colorista dark pads of paper with thick spot UV. It is black paper with ridges that make of the drawing.
These pages are from Under the Sea and Designer tags 2.
The metallic pencils shine brightly when colored on dark paper. The thick spot UV does not allow the pencils to color on it so it creates the back lines on the drawing just as the ink on white paper does.
The Metallic Pencils can be colored on plain black paper without the thick spot UV.
Where do I find these?
I am sure there are other places to find these things. Mine came from HSN when they were still in stock.