Printed with Epson oil-based printer, using 9-colors of original ink (including white, light red, light blue, and bright orange). The color is more solid and stands out more than most CMYK printers. The latex environmentally friendly printing ink is safe, non-toxic and can retain color even under the sun. It can also be printed at 1800dpi with fine detail and high humidity, making it suitable for all types of advertising.