Difference between revisions of "Barium copper silicate"
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Han blue; Han purple; Chinese blue; Chinese purple; silicato de bario y cobre (Esp.); silicato di rame e bario (It.) | Han blue; Han purple; Chinese blue; Chinese purple; silicato de bario y cobre (Esp.); silicato di rame e bario (It.) | ||
| − | == | + | ==Physical and Chemical Properties== |
| − | The purple is destroyed by dilute acids with some effervescence. The blue is acid-resistant. | + | * The purple is destroyed by dilute acids with some effervescence. |
| + | * The blue is acid-resistant. | ||
| + | * Both colors are strongly birefringent under crossed polars. | ||
| + | * Refractive Index = 1.72-1.74 (purple); 1.593-1.633 (blue) | ||
| − | + | ==Resources and Citations== | |
| − | + | * E.West FitzHugh, L.Zycherman "A Purple Barium Copper Silicate Pigment from Early China" ''Studies in Conservation'' 37:145-154, 1992. | |
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| − | + | * E.West FitzHugh, L.Zycherman "An Early Man-made Blue Pigment from China - Barium Copper Silicate" ''Studies in Conservation'' 28:15-23, 1983. | |
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* Nicholas Eastaugh, Valentine Walsh, Tracey Chaplin, Ruth Siddall, ''Pigment Compendium'', Elsevier Butterworth-Heinemann, Oxford, 2004 | * Nicholas Eastaugh, Valentine Walsh, Tracey Chaplin, Ruth Siddall, ''Pigment Compendium'', Elsevier Butterworth-Heinemann, Oxford, 2004 | ||
Revision as of 08:36, 2 May 2022
Description
A general name for either a blue (BaCuSi4O10) or purple (BaCuSi2O6) pigment found in paints and ceramic glazes on Chinese artifacts from the Han dynasty, 208 BCE - 220 CE.
Synonyms and Related Terms
Han blue; Han purple; Chinese blue; Chinese purple; silicato de bario y cobre (Esp.); silicato di rame e bario (It.)
Physical and Chemical Properties
- The purple is destroyed by dilute acids with some effervescence.
- The blue is acid-resistant.
- Both colors are strongly birefringent under crossed polars.
- Refractive Index = 1.72-1.74 (purple); 1.593-1.633 (blue)
Resources and Citations
- E.West FitzHugh, L.Zycherman "A Purple Barium Copper Silicate Pigment from Early China" Studies in Conservation 37:145-154, 1992.
- E.West FitzHugh, L.Zycherman "An Early Man-made Blue Pigment from China - Barium Copper Silicate" Studies in Conservation 28:15-23, 1983.
- Nicholas Eastaugh, Valentine Walsh, Tracey Chaplin, Ruth Siddall, Pigment Compendium, Elsevier Butterworth-Heinemann, Oxford, 2004