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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.
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.
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 ...
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.
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.
Syrian leader Bashar Assad issued what appeared to be his first public statement since he was ousted and fled with his family to Russia more than a week ago.
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