I was pondering this in relation to a question in a physics quiz and noticed that there didnt seem to be a valid answer on the internet…or anywhere else. If anyone has an answer or can measure this directly I would appreciate the results. An A4 sheet weighs about 4g so the marking on it will probably be measured in microgrammes (no mu symbol on keyboard)

https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcRwZlEMAu5xOx-5GLilc2Glh9MOAWpuVDzCDpWmpPi0I6u4cqtg

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