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Uses. Reusable writing surface on which text or drawings are made. A blackboard or a chalkboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
Chalkboard scraping. Scraping a chalkboard (also known as a blackboard) with one's fingernails produces a sound and feeling which most people find extremely irritating. The basis of the innate reaction to the sound has been studied in the field of psychoacoustics (the branch of psychology concerned with the perception of sound and its ...
Nothing to download, play free board games right now! Browse and play any of the free online board games for free against the AI or against your friends. Enjoy classic board games such as Chess ...
Chalkboard art. Children's drawing on a chalkboard. Chalkboard art or chalk art is the use of chalk on a blackboard as a visual art. [1] It is similar to art using pastels and related to sidewalk art that often uses chalk. Chalkboard art is often used in restaurants, shops or walls. [2]
A child drawing on concrete. Sidewalk chalk is typically large and thick sticks of chalk ( calcium sulfate, gypsum, rather than calcium carbonate, rock chalk) that come in multiple colors and are mostly used for drawing on pavement or concrete sidewalks, frequently four square courts or a hopscotch boards. Blackboard chalk, typically used in ...
Pool: Lucky Break 8 Ball. At Lucky Break Pool, play free online pool hall 8-ball with your friends! Chalk up your favorite pool cue, customize the billiards table, and chat with other players. You ...
Calcite ( calcium carbonate) Chalk is a soft, white, porous, sedimentary carbonate rock. It is a form of limestone composed of the mineral calcite and originally formed deep under the sea by the compression of microscopic plankton that had settled to the sea floor. Chalk is common throughout Western Europe, where deposits underlie parts of ...
Chalkboard paint is a specialized paint that creates a chalkboard-like coating that can be utilized as a writing surface in the same manner as a traditional chalkboard. Chalkboard paint is commonly made out of a mixture of talc , [1] [2] acrylic , [1] water , glycol , titanium dioxide , [3] carbon black , [4] opacifiers , silica , [2] and esters .
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