Well, I put a piece of it in my sock for five hours of shopping, studying, and driving in a hot car today. There was a bit of black lint on my foot, which brushed right off. There's definitely a mark the shape of the fabric on my sock, but it's faint and grey and again I suspect that it's lint/particles rather than dye. So this bodes well for just going ahead and sewing with it.
Ori the Dwarf
Urania, Muse of Astronomy
Random steampunk wardrobe items