I'm looking for the color codes for 552 Epson Photo Black which is actually a gray color. I don't print a lot of color documents or pictures. Based on my experience with the ET-4760 if I go more than seven days without printing a color document odds are good that one or more of the color nozzles will get clogged. To prevent this I created a Word document that has the four colors used by the ET-4760 using their exact numerical values and I print that document once a week unless I've printed color documents or photos. I'm assuming that the color codes for cyan, yellow, magenta, and black are the same for all Epson inks. I have been unsuccessful in finding those numbers for the Photo Black Ink. Any help would be appreciated.