Scientific American's December 1, 2023 The Most Shocking Discovery in Astrophysics Is 25 Years Old outlines the "origin story" for the concept of dark energy, a term used to refer to an apparent acceleration of the rate of metric expansion of space (i.e. the universe).
It includes the following:
They grabbed the nearest blue-and-gray sheet of IBM printout paper, flipped it over and began scribbling a plan: the telescopes to secure, the peers to recruit, the responsibilities to delegate.
I remember the big, wide line printer paper with sprocket holes on both sides and line numbers and alternating bands of shading already printed. I seem to remember green rather than blue, but I didn't work at IBM.
But I haven't a clue of what the "-and-gray" refers to. Due to it's planned obsoleteness it wasn't particularly heavily bleached or brightened with additives, but it seems it was if anything slightly yellowish, not gray. So I'd like to ask:
Question: What did a "blue-and-gray sheet of IBM printout paper" actually look like, circa 1994?
Maybe it's not even line printer paper they're talking about, but I was doing science at the time and we certainly all had stacks of it on our desk ready to go when we didn't want to turn around and get all chalky at the black board (or wanted a permanent record of our calculations).