Nahneun, I dyed using procion jet black dye from dharmatrading co and it worked extremely well. Black is a very hard color to dye a whole garment, but mine turned out perfect. It's a little more expensive and time consuming, but it yields great results. I dyed my linen/cotton geller flight pants that had faded to a very faded black, almost gray back to a deep, rich black. It supposedly works very well on silk too, I believe