Difference between revisions of "Lithograph crayon"

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-[[File:58.606-C36428.jpg|thumb|]]
-== Description ==
-A type of grease pencil used to draw an image on a flat surface for reproduction by the lithographic technique. The crayon lines attract and hold an oily ink used in the printing process. Litho crayons contain [http://cameo.mfa.org/materials/fullrecord.asp?name=tallow tallow] or [http://cameo.mfa.org/materials/fullrecord.asp?name=stearic acid stearic acid], [http://cameo.mfa.org/materials/fullrecord.asp?name=wax wax] ([http://cameo.mfa.org/materials/fullrecord.asp?name=carnauba wax carnauba], [http://cameo.mfa.org/materials/fullrecord.asp?name=beeswax beeswax]), resin ([http://cameo.mfa.org/materials/fullrecord.asp?name=copal copal], [http://cameo.mfa.org/materials/fullrecord.asp?name=shellac shellac]), and [http://cameo.mfa.org/materials/fullrecord.asp?name=lampblack lampblack]. They also contain an alkali, such as [http://cameo.mfa.org/materials/fullrecord.asp?name=lye lye] or [http://cameo.mfa.org/materials/fullrecord.asp?name=potassium carbonate potassium carbonate], to saponify the fatty acids. The ingredients are mixed, heated then cast into sticks for crayons or thin rods for pencils. They are available in varying hardness: five for the pencil type and seven for the crayon type.
-See also [http://cameo.mfa.org/materials/fullrecord.asp?name=tusche tusche].
-[[File:lithog.crayon_gen.jpg|thumb|Lithograph crayon]]
-== Synonyms and Related Terms ==
-litho crayon; lithographic crayon
-== Other Properties ==
-Soluble in aromatic hydrocarbons, turpentine.Slightly soluble in ethanol, water.
-== Hazards and Safety ==
-Halos may form when used on absorbent material.Bloom may form on surface.
-== Additional Information ==
-M.Holben Ellis, M.Brigitte Yeh,"Categories of Wax-based Drawing Media" WAAC Newsletter, Vol 19(3), 1997.
-== Authority ==
-* Ralph Mayer, Ralph Mayer, ''A Dictionary of Art Terms and Techniques'', Harper and Row Publishers, New York, 1969 (also 1945 printing)
-* Michael McCann, Michael McCann, ''Artist Beware'', Watson-Guptill Publications, New York City, 1979
-* Book and Paper Group, Book and Paper Group, ''Paper Conservation Catalog'', AIC, 1984, 1989
-* ''A Glossary of Paper Conservation Terms'', Margaret Ellis (ed.), Conservation Center of the Institute of Fine Arts, New York City, 1998
-[[Category:Materials database]]

Difference between revisions of "Lithograph crayon"

Revision as of 07:31, 24 July 2013

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