Every newspaper reader knows the problem. Spend five minutes thumbing through and your hands and shirt are filthy. Saranda Corp., of Dayton, has developed a new ink that won't come off, because it actually dyes paper fibers. Conventional inks just sit on top of the fibers in an oily base. Now the company has to convince publishers to pay extra to give customers clean reading -- 7? a pound, or $200,000 a year, for a large daily.