Gesso" ['d ?? s ? o] is the Italian word for "Board chalk" (akin to the Greek word "gypsum "), and is a powdered form of the mineral calcium carbonate used in art.
http://en.wikipedia.org/wiki/Gesso

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Gesso Communications is a marketing communications firm in Halifax, Nova Scotia, specializing in interactive, print, branding and identity development.
http://www.gesso.ca/

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http://dictionary.reference.com/search?q=gesso

A brief history and how-to tutorial about using gesso in your art journals. ... Gesso What it is and how to use it ©2005 - 2007 by aisling d'art . Gesso is a useful option for art ...
http://www.aisling.net/journaling/gesso.htm