Amber

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MFA Acc. #: 38.1396

Contents

Description

1) An obsolete name for any hard resin.

2) True amber is a yellowish, hard, glassy, fossil resin which is most commonly found in the region of the Baltic Sea. Types of amber classified by location include Baltic amber (succinite), Rumanian (rumanite), Sicilian (simetite) and Burmese amber (burmite). Amber is composed of complex mixtures of oxidized and polymerized resin acids and resin alcohols. Amber is broadly classified by composition as succinite amber when it contains succinic acid (usually 3-8%: also called true amber) and retinite amber when it does not (Serpico and White 2000). Amber has been gathered or mined since Paleolithic times. Amber develops an electrical charge when rubbed with a cloth. It is easy to carve and was often used in its natural state for jewelry, beads, amulets, and small vessels. Amber was also used as an ingredient in paint. Dark color oil/amber varnishes are made by dissolving melted amber in amber oil, turpentine oil, or a drying oil.

MFA Acc. #: 02.217

Synonyms and Related Terms

ambre (Fr.); ámbar (Esp.); rav (Dan., Nor.); simetita (Esp.); ambra (It.); barnsteen (Ned.); âmbar (Port.); bärnsten (Sven.); elektron (Gr.); Bernstein (Deut.); lyncurium; electrum; succinum; vernix; fornix; glassa; Bernice's Stone; berenice; resinite; retinite


Types include: succinite (Baltic, largest deposit); rumanite (Rumania); simetite (Sicily, retinite); burmite (Burma, usually red); allingite (Switzerland); beckerite (Baltic, dense and polishes poorly); delatynite (Russia); gedanite (Baltic, poor working properties); glessite (Baltic); krantzite (Saxony, soft); schraufite (Carpathian mt.); stantienite (Baltic, easily fractures); ambrite (New Zealand); amekit (Nigeria); chemawinite (Canada); Dominican republic amber (second largest deposit); hachettite (Italy); loban (near Mecca); Mexican retinite; North American amber

FTIR

Baltic amber.jpg


Other Properties

Amber is very resistant to acids and alkalis and is not entirely soluble in any solvent. A drop of ether will not affect the surface of true amber, but will leave other resins slightly sticky. Amber fluoresces a strong yellowish green to bluish white in short-wave UV light.

Saponification number = 115 ; Acid number = 15-35

Succinites emit succinic acid when heated

Mohs Hardness 2.5 - 3.0
Melting Point 290-300
Density 1.05-1.1
Refractive Index 1.54 - 1.55

Hazards and Safety

No significant hazards.

Additional Information

° David A Grimaldi, Amber:Window to the Past, The American Museum of Natural History with Harry N. Abrams, New York, 1996.° D.Thickett, P.Cruickshank, C.Ward, "The Conservation of Amber" Studies in Conservation, 40:217-226, 1995. ° M.Serpico, R.White, "Resins, Amber and Bitumen" in Ancient Egyptian Materials and Technology, P.Nicholson, I.Shaw (eds.), Cambridge University Press, 2000, p. 430-474.° Ancient Trade Routes: Website

Comparisons

Properties of Natural Resins

Properties of Natural Resins


Additional Images


Authority

  • R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966
  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: ref. index = 1.55
  • The Dictionary of Art, Grove's Dictionaries Inc., New York, 1996 Comment: Amber
  • Hermann Kuhn, Conservation and Restoration of Works of Art and Antiquities, Butterworths, London, 1986
  • Tom Rowland, Noel Riley, A-Z Guide to Cleaning, Conserving and Repairing Antiques, Constable and Co., Ltd., London, 1981
  • Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
  • Oppi Untracht, Jewelry Concepts and Technology, Doubleday & Co., Inc., New York City, 1985 Comment: specific gravity = 1.08-1.10; hardness Mohs scale= 2.5 - 3.0; Refractive index= 1.54
  • Jack Odgen, Jewellery of the Ancient World, Rizzoli International Publications Inc., New York City, 1982
  • A.Lucas, J.R.Harris, Ancient Egyptian Materials and Industries, Edward Arnold Publishers Ltd., London, 4th edition, 1962
  • CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: density=1.06-1.11; ref. index=1.546

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