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Chalk

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by

Rachel Pusen

on 14 April 2013

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Transcript of Chalk

What is Chalk? * Naturally occurring Calcium Carbonate
(CaCO3)
* Decompoistion of Plankton Sidewalk/Classroom Chalk * CaCo3 mixed with water, then baked
* Rolled into cylinder shape
* Dry pigments used for color Artist's Chalk * Calcium Sulfite (CaSO4)
* Decomposition of ocean Brine
* CaSO4 is dehydrated, then clay and
oil is added
* Air dried instead of baked
* Pastels History * Chalk can be traced back early through human
history
* Natural Chalk colors; Red, Black, White
* Red chalk (sanguine) used by ancient Egyptians
and Romans for wall drawings
* 16th century black chalk popular with artists
(CaCo3 + C)
* 18th century we are able to manufacture chalk in
different colors Pigments * Carbon (C) -- Black
* Ferric Oxide (Fe2O3) -- Red
* Lead(II)Chromate (PbCrO4) –- Cobalt Yellow
* FeCl3 + K4(Fe(CN)6) –- Prussian Blue Types of Chalk * Sidewalk Chalk * Pastels * Classroom Chalk * Glow in the Dark AND... Lights Out!!! "chalk." The Concise Oxford Dictionary of Art Terms. Oxford Art Online. Oxford University Press.Web. 14 Apr. 2013.http://www.oxfordartonline.com.libproxy.ggc.edu/subscriber/article/opr/t4/e398
"Sidewalk Chalk." Wikipedia. Wikimedia Foundation, 04 Apr. 2013. Web. 14 Apr. 2013.
"How Products Are Made." How Chalk Is Made. N.p., n.d. Web. 14 Apr. 2013.
Shirley Millidge. "Chalk." Grove Art Online. Oxford Art Online. Oxford University Press. Web. 14 Apr. 2013. <http://www.oxfordartonline.com.libproxy.ggc.edu/subscriber/article/grove/art/T015736>.
"Chrome Yellow." Pigments through the Ages. N.p., n.d. Web. 14 Apr. 2013.
"Chalk." How Products are Made. Ed. Stacey L. Blachford. Vol. 1. Gale Cengage, 2002. eNotes.com. 14 Apr, 2013 http://www.enotes.com/chalk-reference/
Global contribution of echinoderms to the marine carbon cycle: CaCO 3budget and benthic compartments
Mario Lebrato, Debora Iglesias-Rodríguez, Richard A. Feely, Dana Greeley, Daniel O. B. Jones, Nadia Suarez-Bosche, Richard S. Lampitt, Joan E. Cartes, Darryl R. H. Green and Belinda Alker
Ecological Monographs , Vol. 80, No. 3 (August 2010), pp. 441-467
Published by: Ecological Society of America
Article Stable URL: http://www.jstor.org.libproxy.ggc.edu/stable/20787441
References
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