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  2. Chalkboard eraser - Wikipedia

    en.wikipedia.org/wiki/Chalkboard_eraser

    A chalkboard eraser (sometimes known as a duster in India and elsewhere [1] [2]) is a special type of eraser specifically used to erase chalk markings on slating paint (used on chalkboards and slates). It is most commonly made of felt strips attached to a handle. Chalkboard erasers are typically broad and rectangular, intended to clear large ...

  3. Eraser - Wikipedia

    en.wikipedia.org/wiki/Eraser

    Chalk writing leaves light-colored particles weakly adhering to a dark surface (e.g., white on black, or yellow on green); it can be rubbed off with a soft material, such as a rag. Erasers for chalkboards are made, with a block of plastic or wood, much larger than an eraser for pen or pencil, with a layer of felt on one side.

  4. Blackboard - Wikipedia

    en.wikipedia.org/wiki/Blackboard

    Stick-slip effect with a chalk on a blackboard. Chalk sticks are produced in white and in various colours, especially for use with blackboards. White chalk sticks are made mainly from calcium carbonate derived from mineral chalk or limestone, while coloured chalk sticks are made from calcium sulphate in its dihydrate form, CaSO 4 ·2H 2 O, derived from gypsum.

  5. Wet-wipe marker - Wikipedia

    en.wikipedia.org/wiki/Wet-wipe_marker

    Wet wipe markers were often used on overhead projector transparencies, as they could be stored and transported easily, unlike a traditional chalkboard. With the rise of computerized slide-shows (e.g. PowerPoint) in the classroom and office, overhead usage has reduced substantially, and with it, the wet wipe marker. Marks can then be cleaned off ...

  6. Permanent marker - Wikipedia

    en.wikipedia.org/wiki/Permanent_marker

    A permanent marker can also be removed by drawing over it with a dry erase marker on non-porous surfaces such as a whiteboard, [3] as dry erase markers also contain a non-polar solvent. Most dry-erase board cleaner solutions also contain effective organic solvents like 2-butoxyethanol to remove the pigment.

  7. Ink eraser - Wikipedia

    en.wikipedia.org/wiki/Ink_eraser

    In concert with bladed ink erasers, an eraser similar to those at the end of pencils was also used, with additional abrasives, such as sand, mixed into the rubber. Fibreglass ink erasers also work by abrasion. These erasers physically remove the ink and the paper it has marked from the larger sheet.

  8. Whiteboard - Wikipedia

    en.wikipedia.org/wiki/Whiteboard

    A whiteboard (also known by marker board, dry-erase board, dry-wipe board, and pen-board) is a glossy, usually white surface for making non-permanent markings. Whiteboards are analogous to blackboards , but with a smoother surface allowing for rapid marking and erasing of markings on their surface.

  9. Do Not Erase: Mathematicians and Their Chalkboards

    en.wikipedia.org/wiki/Do_Not_Erase:...

    Do Not Erase is formatted as a sequence of 109 two-page spreads, [3] printed unusually in landscape mode: the pages are approximately letter size, but wider than they are tall. [2] Each spread features a full-color photograph of a mathematician's chalkboard, generally viewed straight on without visual embellishment, [ 1 ] although some include ...