Printer test page
If your having issues with your printers colours, you can check which colour is the issue by printing a test page. Mostly inkjet and laser printers work 4 different cartridges cyan, magenta, yellow and black. By printing a test page you will be able to check which cartridge your having issue with or running out as not all printers monitors keep the true level of ink in the cartridge.
Can order via www.inkjet.co UK online ink supplier