Black fax to harass large institutions or government departments, to retaliate against the senders of junk faxes, or merely as simple pranks. The basic principle of a black fax can be extended to form a "black fax attack." In this case, one or more sheets are fed halfway through the sender's fax machine and taped end to end, forming an endless loop that cycles through the machine. Not only can solid black be used, but also images which will repeat endlessly on the receiver's machine until its toner runs out. The introduction of computer-based facsimile systems (combined with integrated document imaging solutions)
Fax from Sarajevo many other titles, was one recipient. Collaborating long-distance, they collected Rustemagić's account of life during wartime, with Kubert turning the raw faxes into a somber comics tale that won both of the comics industry's two major accolades, the Eisner Award and the Harvey Award. "Fax from Sarajevo" was initially released as a 207-page hardcover book and two years later as a 224-page trade paperback. The book is augmented with transcripts of the faxes sent by Rustemagić, as well those by his associates in the American and European comics industry. In addition, many photos of war-torn Sarajevo, taken by Karim Zaimović