black fax
n. A black piece of paper faxed to a company as a prank or as retaliation for distributing junk faxes.
Exasperated victims are finding unusual ways of fighting back. Those unable to contact the junk-fax firms have been known to vent their frustrations on companies featured in the ads. Some, for instance, have tied up the fax machine of Toronto-based Value-Rite Business Products by repeatedly sending the same document, says marketing manager Jay DeGenova. Others have used up his toner by sending a solid-black fax 20 times.
—John Schofield, “Unsolicited and often unwanted,” Maclean's, November 01, 1998
Hyde's fellow congressmen asked the FBI to investigate Salon, hackers tried to shut down its Web site ( ), and the Web zine's editors faced death threats, bomb scares, waves of junk E-mail and black faxes.
—Chris Dafoe, “Naked mud wrestling in a literary salon,” The Globe and Mail (Canada), October 28, 1998
1996 (earliest)
But, as is almost always the case, the answer to the abuse of technology is more and better technology. Rather than retreating from those who would use the Internet against us, we have more than enough means at our disposal to filter unwanted solicitation, disseminate lists of offenders, or demand payment for reviewing their promotional materials.

And if all else fails, there's always the dreaded black fax.
—Douglass Rushkoff, “Leading spams to slaughter,” The Weekend Australian, December 07, 1996
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