To test the grain of paper use one of the following:
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Moisten two right-angle edges of a sheet, and press between fingers. As the sheet dries, the edge across the grain will be wavy, the edge with the grain will be straight.
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Tear the sheet in two directions. It tears straighter and cleaner with the grain.
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Fold the sheet in two directions. It folds easier and smoother with the grain.
End-use need, design considerations, print quality and budgetary needs should go into deciding what paper to use.
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This section is drawn from information online at http://www.gregathcompany.com/archival.html