Gravure printing, like lithography and letterpress uses rotating cylinders to create different printing. The process is less complicated than flexography and lithography. An ink tray (cooled to a specific temperature) sits on the bottom, while a gravure cylinder or form cylinder spins around in the cooled ink. The ink used is a very fluid liquid ink, different from lithography ink. The ink must be between the temperatures of 70°F – 80 °F so it will keep proper viscosity and not lead to weak printing. The higher the ink temperature, the thinner it becomes. Thin ink can become illegible, and not properly adhere to the print medium. Once the cylinder is covered in ink, a doctor blade is used to make sure there is not too much ink on the engraved cylinder. The impression roller presses against the form cylinder. The printing medium is wedged between the two, and the medium becomes printed.