Blue verditer

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Blue verditer

Contents

Description

Synthetically prepared azure blue pigment composed of basic copper carbonate. Blue verditer was first made in the 17th century and became widely used in the 19th century for both distemper and oil based interior house paints. It is no longer commonly used. Blue verditer particles are more rounded and regular in size than ground azurite.

Blue verditer

Synonyms and Related Terms

basic copper carbonate (synthetic); Pigment Blue 30; CI 77420; Bremerblau (Deut.); bleu de Brême (Fr.); bleu de montagne (Fr.); azul montaña (Esp.); verdeterra blu (It.); basisch kopercarbonaat (syn) (Ned.); blue bice; copper blue; Bremen blue; cendres blue; ashes blue; mountain blue, lime blue

FTIR

MFA- Blue verditer.jpg

FTIR

Blue verditer (MFA 436).PNG

XRD

PIG436.jpg

SEM

F436sem.jpg

EDS

F436edsbw.jpg

XRF

Slide3 F436.PNG


Other Properties

Insoluble in water and ethanol. Decomposes in acids with the evolution of carbon dioxide bubbles. Turns black with warm alkalis, hydrogen sulfide or sulfur fumes.

Microscopically appears as tiny round aggregates that are highly birefringent and blue in transmitted light. Pleochroic from pale blue to deep blue.

Composition 2CuCO3-Cu(OH)2
Density 3.8
Refractive Index 1.730; 1.838; 1.758

Additional Information

° R. Gettens, and E. West Fitzhugh, "Azurite and Blue Verditer", Artists Pigments, Vol. 2., A. Roy ed. Oxford University Press, Oxford, 1993.

Comparisons

Characteristics of Common Blue Pigments


Additional Images


Sources Checked for Data in Record

  • Artists' Pigments: A Handbook of their History and Characteristics, Ashok Roy (ed.), National Gallery of Art, Washington DC, Vol. 2, 1993 Comment: R. Gettens, and E. West Fitzhugh, "Azurite and Blue Verditer" cites uses of verditer in house paints as early as 1638 and 1671.
  • 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) Comment: probably originating in the 18th c.; widely used in the 19th c.
  • R.D. Harley, Artists' Pigments c. 1600-1835, Butterworth Scientific, London, 1982 Comment: relatively new color in the 17th c.
  • Kurt Wehlte, The Materials and Techniques of Painting, Van Nostrand Reinhold Co., New York, 1975
  • R. Newman, E. Farrell, 'House Paint Pigments', Paint in America , R. Moss ed., Preservation Press, New York City, 1994
  • Book and Paper Group, Paper Conservation Catalog, AIC, 1984, 1989

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