My dad worked on Heidelberg 4 colour litho presses most of his life. We used to go in to his factory every Friday after school for pay day. I was never short of pads of paper to draw on as a kid and always had pots of coloured dots of card around that came from the hole punches. I doubt the factory would pass H&S inspections these days, even in the late 70s / early 80s it was a bit dodgy (he moved to a company in a modern factory by the mid 80s).