Working diligently on a project, my printer signaled it needed a new black cartridge. No problem, I had two carts on the shelf from 4INKJET.com. Because of the two cartridges, I started work confidently. Putting one in, it printed the alignment page. Problem was no black showing up. I put the other in, same thing. Waste of time and money and productivity. I ground everything to a halt, getting into my car, I drove to an office supply store. This was the first time I used gray market cartridges. My advice: the difference in price ain't worth it, certainly those ink products from 4INK. Stick to the genuine cartridges.