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2. Liquid chalk - Wikipedia

   en.wikipedia.org/wiki/Liquid_chalk

   The term liquid chalk, or sharkchalk, refers to several different kinds of liquified chalk including liquid-chalk marking pens (with water-soluble ink), liquid-chalk mixtures (for athletic use: rock climbing, weightlifting, gymnastics), and liquid-chalk hobby-craft paints made of cornstarch and food coloring (some with small amounts of flour).

3. 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.

4. 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 ...

5. Crayola - Wikipedia

   en.wikipedia.org/wiki/Crayola

   Crayola LLC produces a broad range of products other than their famous crayons under the Crayola brand name. These include colored pencils, markers, inks and paints, modeling clays, coloring books, and artists' tools. As with all Crayola products, these are all marketed as non-toxic and safe for use by children. [54]

6. Tally marks - Wikipedia

   en.wikipedia.org/wiki/Tally_marks

   Tally marks on a chalkboard Counting using tally marks at Hanakapiai Beach. The number shown is 82. Tally marks, also called hash marks, are a form of numeral used for counting. They can be thought of as a unary numeral system.

7. Paint marker - Wikipedia

   en.wikipedia.org/wiki/Paint_marker

   Another type of paint marker is the solidified paint pen. This is a type of marker, often contained within a twist tube, that is a cylinder of semi-hardened oil-paint with a pointed tip. As one writes with it, the point wears down and must be advanced to in order to continue writing. The marker leaves a mark similar to that of chalk. It is ...