Hello, I have a quick drawing question--I do large-scale charcoal drawings and typically start by drawing a grid to help with proportions etc...however when the drawing is done I've run into trouble in the past being able to fully make those grid lines disappear in areas where the white of the paper remains. 

Is there a type of pencil (or eraser, or technique) that anyone can recommend that erases exceptionally well?  I'm using Borden/Reilly 116 Sketch vellum, a fairly heavy paper.

Thanks as always, Molly


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