If you see that in spite of setting the source file as red, for example, the printing documents are not printing red. The same could happen with the green color or any other. This is a common issue with almost every printer occurring due to low or empty ink or if the cartridge heads are dirty. So, if you are wondering why is my hp printer not printing black correctly or why is my HP Printer is not printing green color properly, ensure that the print heads are thoroughly cleaned and that the ink cartridge is not empty.
