It’s no secret that printing on dead trees is a dying art — hello, declining newspaper industry! — but today’s Federal Register contained another reminder at how much the industry has changed. Blue-collar federal printers and lithographers in the Washington area have officially lost their special wage scale. The Office of Personnel Management says the number of Washington-area printers and lithographers has plummeted in recent years — from 235 in 2004 to 24 this summer, spread across 10 agencies — and it no longer makes sense to offer them different wage rates. (Also, none of those 24 remaining printers or…