It's called a "non-repro blue pencil". Originally it was used by animators. When they xeroxed their art, the blue wouldn't show up for some odd reason. Something with the xerox machine repelling only blue. ^^; Which is why if you look at comic paper, all the margins are blue too.
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timeasmymeasure
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Date: 2007-05-11 04:43 am (UTC)