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2. Blackboard - Wikipedia

   en.wikipedia.org/wiki/Blackboard

   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.

3. Wet-wipe marker - Wikipedia

   en.wikipedia.org/wiki/Wet-wipe_marker

   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.

4. Liquid chalk - Wikipedia

   en.wikipedia.org/wiki/Liquid_chalk

   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).

5. Utility repair tag - Wikipedia

   en.wikipedia.org/wiki/Utility_repair_tag

   Utility repair tag for a patch in New York City made by Con Edison in 2014. Utility repair tag (also known as A-tag, asphalt tag and road cut medallion) is a plastic color-coded pavement marker embedded in the top surface of an asphalt utility cut restoration to identify the responsible party of that pavement repair or patch.

6. Marker pen - Wikipedia

   en.wikipedia.org/wiki/Marker_pen

   The tip of a green felt-tip pen A box of colored felt-tip pens Marker pen. A marker pen, fine liner, marking pen, felt-tip pen, felt pen, flow marker, sign pen (in South Korea), vivid (in New Zealand), flomaster (in East and South Slavic countries), texta (in Australia), sketch pen (in South Asia), koki (in South Africa) or simply marker is a pen which has its own ink source and a tip made of ...

7. Paint - Wikipedia

   en.wikipedia.org/wiki/Paint

   A collection of cans of paint and variants A huge collection of different kinds of spray cans, markers, paints, and inks in the underground graffiti shop. Russia, Tver City, 2011. Blue color paint smears. Primer is a preparatory coating put on materials before applying the paint itself.