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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 ...
Crayola LLC, formerly the Binney & Smith Company, is an American manufacturing and retail company specializing in art supplies. It is known for its brand Crayola and best known for its crayons. The company is headquartered in Forks Township, Pennsylvania in the Lehigh Valley region of the state.
The name Crayola was suggested by Alice Binney, wife of company founder Edwin Binney, combining craie, French for "chalk," a reference to the pastels that preceded and lent their name to the first drawing crayons, with the suffix -ola, meaning "oleaginous," a reference to the wax from which the crayons were made. [1]
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 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.
In August 1976, the company launched the first Expo dry erase marker. [4] In November 1986, the company launched a new marker named Expo II. It featured an alcohol-based ink instead of methyl isobutyl ketone. Sanford discontinued the Expo 2 in the 2010s and changed this line to the alcohol-based ink. [5] Former "Sanford" logo, used until 2019
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