If you erase pencil marks from a paper, you can still see that the pencil was there. How do you get rid of that? - Quora
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Different Types of Erasers are used by Artists to Achieve Realistic Drawings.
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Simple Ways to Use a Kneaded Eraser: 12 Steps (with Pictures)
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Simple Ways to Use a Kneaded Eraser: 12 Steps (with Pictures)