Powdered graphite is a superb dry lubricant, but it's filthy stuff if you get it on you. I've sprinkled and smeared a little on that paper to try to give an idea.
My dad probably used it as a lock lubricant -- that's one of its commonest uses.
Graphite is also a fine lubricant for tiny plastic parts that rub/slide against one another. Such things are common in laser and impact printers. When I worked in the printer service field, I kept a big, soft pencil near at hand; it made a good tool for rubbing a coating of graphite on the surfaces of parts that were prone to bind.
I'll put the pictured tube of graphite in the cabinet where I keep specialized lubricants.
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