Solution: To keep your grays neutral and consistent throughout the print run, it’s best to create gray using only a screen of black. Light gray can be accomplished using 10-30% black, medium grays can be achieved from 40-60% black and dark grays between 70-85% black. Creating gray using all four colors (CMYK) opens the door to color variation with warm, cool or brownish gray tones. A slight shift on press toward magenta will make a pink-gray, any shift toward cyan will make a blue-gray and too much yellow will make a brown-gray.