"Oh I don't know," Rincewind temporises. "There are plenty of shadows about." Lots of them lurk menacingly in the back rooms of the pub, but that might just be Ivonka's influence. "Right." Pause. "Sorry? Are they alchemists then?"
Rincewind snorts. "Not librarians of magical books!" he says stoutly.
Oh no! I finally had to get new ones earlier this year, but that was because my prescription had changed so much my old ones were useless. Good luck with yours!