Difference between revisions of "Egg"
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== Description == | == Description == | ||
| − | A term whose primary meaning in art, refers to the ellipsoidal shell and embryonic contents produced by birds. For paintings, the egg contents are used as a tempera medium. The whole egg, yolk, or white may be used sometimes mixed with oil and/or resin. The [ | + | A term whose primary meaning in art, refers to the ellipsoidal shell and embryonic contents produced by birds. For paintings, the egg contents are used as a tempera medium. The whole egg, yolk, or white may be used sometimes mixed with oil and/or resin. The [[egg yolk]] is a stable emulsion of an aqueous liquid with an oily, proteinaceous medium which dries quickly into a hard, insoluble film. [[Egg white]], or glair, has been used as a medium for illuminated manuscripts. It is also used as a size for attaching [[gold leaf]]. [[Albumen]] is the adhesive substance of egg white. As a pure film, albumen is clear, brittle, and water soluble. Water solubility can be decreased by heating or adding [[tannin]]. The exterior of a bird egg is covered with a brittle [[eggshell|shell]] composed of [[keratin]] and [[calcite]]. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
Revision as of 19:25, 14 January 2014
Description
A term whose primary meaning in art, refers to the ellipsoidal shell and embryonic contents produced by birds. For paintings, the egg contents are used as a tempera medium. The whole egg, yolk, or white may be used sometimes mixed with oil and/or resin. The Egg yolk is a stable emulsion of an aqueous liquid with an oily, proteinaceous medium which dries quickly into a hard, insoluble film. Egg white, or glair, has been used as a medium for illuminated manuscripts. It is also used as a size for attaching Gold leaf. Albumen is the adhesive substance of egg white. As a pure film, albumen is clear, brittle, and water soluble. Water solubility can be decreased by heating or adding Tannin. The exterior of a bird egg is covered with a brittle shell composed of Keratin and Calcite.
Synonyms and Related Terms
Ei (Deut.); huevo (Esp.); œuf (Fr.); uovo (It.); ei (Ned.); jajo (Po.); ovo (Port.); ägg (Sven.)
Other Properties
Miscible with water when fresh. Insoluble in water after heating.
Authority
- R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966
- Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)
- John S. Mills, Raymond White, The Organic Chemistry of Museum Objects, Butterworth Heineman, London, 2nd ed., 1994
- Wikipedia, the free encyclopedia, at http://www.wikipedia.com Comment: http://en.wikipedia.org/wiki/Egg_%28biology%29 (Accessed Nov. 2, 2005)
- Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998