Printer detected cartridges - Unfortunately easier filming

The cartridges arrived quickly. My Officejet 4500 Wireless has also recognized immediately and after a brief alignment of the printing process could begin. On closer examination, unfortunately, a slight veil reveals, so the cartridges print not as clean as the original HP. To what extent the number of pages from 900 true, I can not judge. After nearly 200 pages but I was already indicating that the ink level of the black cartridge would be low. But also seems to have been only an error message because it was ever to print another 200 pages no problem. I'm curious how long the cartridges yet.