Dressmakers’ carbon is designed to rub off with a dry or wet cloth (depends on the carbon and the fabric, etc.), so marks will not be left on the finished product. I have no idea if regular carbon would stain or bleed on your fabric or embroidery. Even dressmakers’ carbon paper, pencils, and markers say to remove the marks before laundering or ironing, however, because the marks may not come out or might change color. I don't find it makes much difference for my projects, though. I mostly just trace patterns, and the marks are at the edges and are usually trimmed off or sewn over.