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Jim,
I found that the scribe weakens the fibers of the paper so that they will tear easier in tension and when the scribe is in the outside of the fold (mountain side in origami) they will tear a bit. it is not bad but can look not so good as the white paper shows a lilttle. With the crease on the inside (valley) the damage is in compression and so does not tear. To mark the crease I use a pin and punch holes at each end of the line to be creased. It can get confusing if there are lots of creases.
George
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