1. Contact printing methods also minimize the amount of QD required, reducing costs.2. She experimented with color printing, multiple exposure, orthochromatic film, and contact printing . 3. The contact printing process has the advantage that no large-field optical system is required. 4. This is known as robotic contact printing or robotic spotting. 5. An example of a non-contact printing system is the Piezorray Flexible Non-contact Microarraying System. 6. Computer screens and other electronic display devices provide an alternative approach to contact printing . 7. This process produced a translucent original positives could be made by simple contact printing . 8. Another example of a contact printing system is the Qarray system ( Genetix ). 9. This includes the use of electric fields in polar alignment, electrophoresis, mircofluidic methods and contact printing . 10. Contact printing allows fabrication of multi-color QD-LEDs.