Difference between revisions of "Terra alba"
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== Description == | == Description == | ||
| − | A fine-grain, white pigment prepared from powdered [ | + | A fine-grain, white pigment prepared from powdered [[gypsum|gypsum]]. Terra alba was occasionally mixed with glue for gesso ground in mediaval and Renaissance panel paintings (Gettens and Stout1966). |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
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gypsum | gypsum | ||
| − | == | + | == Physical and Chemical Properties == |
| − | Soluble in water. Slightly soluble in glycerol and weak acids. Precipitates as needle-like crystals. Insoluble in most organic solvents. | + | * Soluble in water. Slightly soluble in glycerol and weak acids. |
| − | + | * Precipitates as needle-like crystals. | |
| − | Low birefringence. | + | * Insoluble in most organic solvents. |
| + | * Low birefringence. | ||
{| class="wikitable" | {| class="wikitable" | ||
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! scope="row"| Density | ! scope="row"| Density | ||
| − | | 2.32 | + | | 2.32 g/ml |
|- | |- | ||
! scope="row"| Refractive Index | ! scope="row"| Refractive Index | ||
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| − | == | + | ==Resources and Citations== |
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* R. J. Gettens, G.L. Stout, ''Painting Materials, A Short Encyclopaedia'', Dover Publications, New York, 1966 | * R. J. Gettens, G.L. Stout, ''Painting Materials, A Short Encyclopaedia'', Dover Publications, New York, 1966 | ||
Latest revision as of 10:27, 8 June 2022
Description
A fine-grain, white pigment prepared from powdered Gypsum. Terra alba was occasionally mixed with glue for gesso ground in mediaval and Renaissance panel paintings (Gettens and Stout1966).
Synonyms and Related Terms
gypsum
Physical and Chemical Properties
- Soluble in water. Slightly soluble in glycerol and weak acids.
- Precipitates as needle-like crystals.
- Insoluble in most organic solvents.
- Low birefringence.
| Composition | CaSO4-2H2O |
|---|---|
| Density | 2.32 g/ml |
| Refractive Index | 1.523 |
Resources and Citations
- R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966
- R. Mayer, The Artist's Handbook of Materials and Techniques, Viking Press, New York, 1981
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 385
- Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982