A complex gum/oil/resin mixture obtained from the stems of carrot family plant, Dorema ammoniacum, native to Iran and India. Ammoniac is a strong smelling exudate that dries to form hard, brittle, dark yellow lumps. It contains approximately 50-70% resin, 18-26% gum and 1-7% oil. Ammoniac is typically prepared for use either as a water emulsion or as a mixture with mastic and isinglass. This makes a strong cement that is used to adhere gilding, set gemstones, and repair porcelain. Ammoniac is also used in perfumes and medicine.
Synonyms and Related Terms
Dorema ammoniacum; gum ammoniac; goma amoniaco (Esp.); ammoniacum; ammoniakum; ammonial gum
Slightly soluble in water, ethanol, ether, vinegar or weak alkali. Forms emulsions with water.
Hazards and Safety
Ingestion may cause vomiting.
P. Lynn, "How to Prepare and Gild with Gum Ammoniac" www.geocities.com/CollegePark/Library/2036/gumammon.html
Sources Checked for Data in Record
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 664
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 518
- Website address 1 Comment: "How to Prepare and Gild with Gum Ammoniac" by Peter Lynn www.geocities.com/CollegePark/Library/2036/gumammon.html
- George Savage, Art and Antique Restorer's Handbook, Rockliff Publishing Corp, London, 1954
- Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000