> It’s surprisingly dark, too. For decades, Intel’s cleanrooms have been lit like darkrooms, bathed in a deep, low yellow. “That’s an anachronism,” says Mark Bohr, a small, serious man who has spent his entire 38-year career making chips, and who’s now Intel’s top manufacturing scientist. “Nobody’s had the courage to change it.”

Wait, what? Isn't that UV-free light? Ultraviolet light is used in the mask exposure step, so using normal light in the room would basically remove all of the photoresist before photolithography.

I guess they've automated the process to the point where the wafers are never exposed to light even when moving between steps.