Difference between revisions of "Lime casein"
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== Description == | == Description == | ||
| − | A paint binder or adhesive prepared by hydrolyzing [ | + | A paint binder or adhesive prepared by hydrolyzing [[casein]] powder in water with [[lime]] ([[calcium oxide]]). Lime casein is a clear, viscous solution that dries to form a water-insoluble film. Lime casein has a high pH (9.0-9.9) compared to [[ammonium casein]] (8.0-9.0), and [[borax casein]] (7.0-7.8). Lime casein is often used as a ground or size for wall paintings on lime plaster, gypsum plaster and stone. It dries to a brittle, insoluble, matte film. Occasionally a plasticizer, such as [[glycerol]] or [[sorbitol]] and a preservative, such as phenol, are added to the solution. Lime casein is also used as a paint binder. Because of its alkalinity, however, its pigment palette is limited (see fresco pigments). Earlier conservation uses have included lime casein as a consolidant for wall paintings and wall plaster. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
Revision as of 12:40, 21 January 2014
Description
A paint binder or adhesive prepared by hydrolyzing Casein powder in water with Lime (Calcium oxide). Lime casein is a clear, viscous solution that dries to form a water-insoluble film. Lime casein has a high pH (9.0-9.9) compared to Ammonium casein (8.0-9.0), and Borax casein (7.0-7.8). Lime casein is often used as a ground or size for wall paintings on lime plaster, gypsum plaster and stone. It dries to a brittle, insoluble, matte film. Occasionally a plasticizer, such as Glycerol or Sorbitol and a preservative, such as phenol, are added to the solution. Lime casein is also used as a paint binder. Because of its alkalinity, however, its pigment palette is limited (see fresco pigments). Earlier conservation uses have included lime casein as a consolidant for wall paintings and wall plaster.
Synonyms and Related Terms
caseinato de calcio (Esp.); lime-casein; casein adhesive; casein glue; calcium caesinate
Hazards and Safety
Casein is susceptible to biodeterioration, especially in humid environments.
Additional Information
° H.K.Salzberg, "Casein Glues and Adhesives" in Handbook of Adhesives, I.Skeist (ed.), Van Nostrand Reinhold, New York, 1977, p.158-171. ° K.Wehlte, The Materials and Techniques of Painting, Van Nostrand Reinhold Co., New York, 1975.
Authority
- Kurt Wehlte, The Materials and Techniques of Painting, Van Nostrand Reinhold Co., New York, 1975
- Irving Skeist, Handbook of Adhesives, Van Nostrand Reinhold Company, New York, 1977
- Website address 1 Comment: http://www.jcms.ucl.ac.uk/issue5/cons98.html#farmakalidis