Been having issues with my black having banding issues,so I had a customer that is a third party designer send some work over last week and when I printed it there was two different blacks, one was like I normally print and the other looked like my pr-43k red it was so black and looked like it was raised off the paige so I asked him what he used and he said regisration black. So I printed some real estate signs today and used it it is the best looking black that I have ever seen. has anyone else ever used this?