‘The Wolf and the Fox,’ 1733, Jean-Baptiste Oudry (French, 1686-1755); Black ink and gray wash heightened with white opaque watercolor on blue paper; frame design in black ink, gray wash and ...

On the other hand, a black ink cartridge only prints black and grey on a document. When you print any of your papers, you set your printer to black &white, but if you want to print images, you ...

The average office worker still prints out 10,000 sheets of paper a year, and reads many only once. What if we could use disappearing ink and reuse each page?