The highest capacity cyan offered for the large format HP printers listed below, the CN636A lowers the cost per page of your machine substantially. The 300ml of cyan ink contained within the Hewlett Packard CN636A makes it a very economically viable purchase.Containing incredibly high quality pigment-based cyan ink, produced by Hewlett Packard themselves, the CN636A gives results that you can be proud of. The CN636A and every colour in the HP 772 range are the premium choice for those that need the very best from their inkjet printers.