Printing on Eco Products is the way New Zealanders want to go. And one of the simplest kinds of printing is with recycled cardboard. It's inexpensive, too. Methods of printing on cardboard are Lithography (also known as litho or offset), Flexography (also known as flexo or flexographic), Digital, Silkscreen (also known as screen) also HP Indigo digital presses, like conventional presses, use liquid ink to print an image.
The major difference, however, is that HP ElectroInk technology directs the ink electronically using charged particles in the ink. HP Indigo digital presses use a light sensitive plate that attracts ink