The highest capacity photo black offered for the large format HP printers listed below, the CN633A lowers the cost per page of your machine substantially. The 300ml of photo black ink contained within the Hewlett Packard CN633A makes it a very economically viable purchase.Containing incredibly high quality pigment-based photo black ink, produced by Hewlett Packard themselves, the CN633A gives results that you can be proud of. The CN633A and every colour in the HP 772 range are the premium choice for those that need the very best from their inkjet printers.