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...of white crumbs upon use (Estabrook, 1989). Surface pH measurement of the Magic Rub® erasers gave a slightly basic value of 8.81 (Estabrook, 1989). Peel-Off Magic Rub eraser

[[File:staedtler mars.jpg|thumb|Staedtler Mars plastic eraser]] [[File:pentel hipoly.jpg|thumb|Pentel Hi-Polymer eraser]]

[[File:powdered eraser.jpg|thumb|Powdered eraser]] ...and pigments. These types of erasers may leave trace amounts of residue ([[eraser crumbs]]) that may later stain paper.