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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 ...
Upcycled steamer trunk painted with chalk paint and topcoated with clear and dark wax. Chalk paint is a water-based, decorative paint invented by Annie Sloan which may be applied over almost any surface. It requires very little preparation and needs a topcoat to avoid flaking. Chalk paints are also used by utility companies to mark road surfaces.
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.
The history of the crayon is not entirely clear. The French word crayon, originally meaning "chalk pencil", dates to around the 16th century, and is derived from the word craie (chalk), which comes from the Latin word creta (Earth). [3] [4] The meaning later changed to simply "pencil", which it still means in modern French. [4]
The Chalk Group (often just called the Chalk) is the lithostratigraphic unit (a certain number of rock strata) which contains the Upper Cretaceous limestone succession in southern and eastern England.
From the late 18th century to the end of the 19th century, bread sold in England and the United States was often adulterated with hazardous materials, including chalk, sawdust, alum, plaster, clay and ammonium carbonate. Frederick Accum was the first to raise alarm to the food adulteration in 1820.
A complete set of snooker balls A sliding scoreboard, some blocks of cue-tip chalk, white chalk-board chalk and two cues A shot using a rest, allowing the player to reach farther down the table A standard full-size snooker table measures 12 ft × 6 ft (365.8 cm × 182.9 cm), with a rectangular playing surface measuring 11 ft 8.5 in × 5 ft 10.0 ...
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]