Erasers, Continued Hand-held erasers (Continued) SPECIAL-PURPOSE  ERASERS:  Special-purpose  erasers  include  art  gum erasers,  kneaded  erasers,  and  pulverized  eraser  particles.  The  super-soft  art gum eraser does not damage paper surfaces, but it will leave a crumbly residue.  Art  gum  erasers  are  light  beige.  Kneaded  erasers  are  light  blue  or light grey with the consistency of putty. This malleable substance absorbs graphite  and  pigment  particles.  Absorption  increases  by  kneading  these erasers  in  your  hand.  Generally,  these  erasers  leave  no  residue  unless  they are too old or too full of absorbed particles.    If these erasers become too warm,  the  substance  may  break  down,  leaving  stains  on  drawing  surfaces.  A kneaded eraser hardens as it ages. Kneaded erasers are used for blending and for highlighting in drawings made with pencil, pastel, and charcoal. Pulverized eraser particles are nonabrasive and remove only the softest of stray marks. They are often used to clean smudges and smears from already completed drawings.    They are available in a can to pour on a drawing, rub, and brush off.    They are also available in an ABC pad which is a soft mesh bag full of particles that you rub against the drawing surface and brush off the residue. The following table shows the types of erasers common to a work center. Eraser Synthetic Hard Purpose Color Remarks Pen  and  pencil White,  amber, Moisten eraser marks on Mylar or and a host of before using, vellum bright colors leaves no residue Dark pencils marks Grey and red Abrades paper and  light  pen  marks surface, leaves no residue Intermediate General  pencil Medium green Leaves little or no marks and dark pink residue Soft Light  pencil  marks, Beige, blue, dark May leave a smudges,   clean-up, grey  and  light crumbly residue and   highlighting pink Continued  on  next  page 1-9