Copper resinate

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Description

The common name for a transparent green glaze containing copper salts of resin acids. Examples of copper resinate layers have been seen on manuscripts dating to the 8th century but it was most commonly used in 15th - 17th c. paintings. Several recipes for copper resinate indicate it is a mixture of verdigris in Venice turpentine while others describe it as a mixture of verdigris in an oil/resin medium. Current preparation techniques melt natural resins then mix in reactive copper salts such as copper acetate, copper hydroxide, copper oxide, or basic copper carbonate (Kuhn 1993).

Synonyms and Related Terms

cupric resinate; transparent copper green; Kupferresinat (Deut.); résinate de cuivre (Fr.); resinato de cobre (Esp., Port.); resinato di rame (It.)

FTIR

Copper Resinate.PNG

FTIR

Copper Resinate, sample 2.PNG


Other Properties

Soluble in ether, oils, and many organic solvents (benzene, chloroform, mineral spirits, etc.). Insoluble in water.

Appears microscopically as irregular, green fragments.

Refractive Index 1.52

Hazards and Safety

Combustible. Decomposes with heat.

Turns brown with exposure to short-wave ultraviolet light.

Additional Information

° H. Kuhn, "Verdigris and Copper Resinate", in Artists Pigments, Volume 2, A. Roy (ed.), Oxford University Press: Oxford, 1993.

° Pigments Through the Ages: Copper Resinate

Sources Checked for Data in Record

  • R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966 Comment: p. 110
  • Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)
  • R. Newman, E. Farrell, 'House Paint Pigments', Paint in America , R. Moss ed., Preservation Press, New York City, 1994
  • The Dictionary of Art, Grove's Dictionaries Inc., New York, 1996 Comment: "Pigments"
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Richard C. Wolbers, Nanette T. Sterman, Chris Stavroudis, Notes for Workshop on New Methods in the Cleaning of Paintings, J.Paul Getty Trust, Los Angeles, 1990

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