a black piece of paper faxed to a company as revenge for distributing junk faxes
STATISTICS
IN THE PRESS
"Frustrated victims are finding unusual ways of fighting back - the black fax. Those unable to contact the junk-fax firms have been known to empty the sender¹s toner cartridge by sending a solid-black fax 20 times." - John Schofield, 'Unsolicited and often unwanted'
(Maclean's - Glossary of Internet Terms - May 2000)