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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).
Bitumen – highly viscous liquid or semi-solid form of petroleum. Blende; Brimstone – sulfur; Flowers of sulfur – formed by distilling sulfur. Caustic potash/caustic wood alkali – potassium hydroxide, formed by adding lime to potash. Caustic Soda/caustic marine alkali – sodium hydroxide, NaOH, formed by adding lime to natron.
Hagoromo Bungu sold the following chalk products: [5] [16] Fulltouch Chalk: calcium chalk; Fulltouch Large Chalk: calcium chalk, 2 cm in diameter and 11.3 cm in length, available in white, red, orange, yellow, green, and blue [25] Fulltouch New Poly: gypsum chalk, sometimes known as plaster chalk; Fulltouch Luminous Color Chalk: gypsum chalk
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.
An interesting halfway is those labels that are considered mandatory by one buying population and effectively preclude purchase if they are not there, e.g. kosher, vegan, and the aforementioned GMO-free label now seen on many organic products. Areas in which mandatory labelling is being discussed [by whom?] include: [citation needed]
Chalk carving is the practice and shaping of chalk via carving. This article covers some methods, types of chalk, tools used and the benefits (and ramifications) of this material. The benefits of this material are also its drawbacks. Its main benefit, its softness, makes it very easy to manipulate.
Regulation 1151/2012 on quality schemes for agricultural products and foodstuffs: defines "labelling" as "any words, particulars, trade marks, brand name, pictorial matter or symbol relating to a foodstuff and placed on any packaging, document, notice, label, ring or collar accompanying or referring to such foodstuff".
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.