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Removing Pen Marks

To remove marking pens from specimen, make a small dike around the area using plumbers putty. Saturate a cotton ball with undiluted household bleach, and place cotton in the dike, making sure the bleach covers the stained area. Let it set for an hour or more. It will remove the stain. Do not leave the bleach on longer than necessary, as it may bleach color from the stone. Rinse.

Breccia, via The Prospector, 7/99