0 Bubblejet printing is a very fast and quiet method of printing in which the ink is directed electronically onto the paper: --
a bubblejet printer
Any inkjet or bubblejet printer can be used to print, although resolution may be poor, and care should be taken to avoid contaminating the edible inks with previously used inks.
Inkjet or bubblejet printers can be converted to print using edible ink, and cartridges of edible ink are commercially available.
