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. | ||
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| + | See also [http://cameo.mfa.org/materials/fullrecord.asp?name=tusche tusche]. | ||
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| + | [[File:lithog.crayon_gen.jpg|thumb|Lithograph crayon]] | ||
| + | == Synonyms and Related Terms == | ||
| + | |||
| + | litho crayon; lithographic crayon | ||
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| + | == Other Properties == | ||
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| + | Soluble in aromatic hydrocarbons, turpentine.Slightly soluble in ethanol, water. | ||
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| + | == Hazards and Safety == | ||
| + | |||
| + | Halos may form when used on absorbent material.Bloom may form on surface. | ||
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| + | == 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) | ||
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| + | * Michael McCann, Michael McCann, ''Artist Beware'', Watson-Guptill Publications, New York City, 1979 | ||
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| + | * Book and Paper Group, Book and Paper Group, ''Paper Conservation Catalog'', AIC, 1984, 1989 | ||
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| + | * ''A Glossary of Paper Conservation Terms'', Margaret Ellis (ed.), Conservation Center of the Institute of Fine Arts, New York City, 1998 | ||
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| + | [[Category:Materials database]] | ||
Revision as of 15:52, 30 September 2014
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 tallow or acid stearic acid, wax (wax carnauba, beeswax), resin (copal, shellac), and lampblack. They also contain an alkali, such as lye or 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 tusche.
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