| 1. | Lead was melted in a bone ash'test'or'cupel'and air blown across the surface.
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| 2. | Bone ash was the major source of phosphorus until the 1840s.
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| 3. | This used bone ash for a phosphate source, as described above.
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| 4. | Sacks of powdery bone ash were emptied in the river.
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| 5. | In 1749, Thomas Frye took out a patent on a porcelain containing bone ash.
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| 6. | Horsford used bone ash, which is mostly calcium carbonate.
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| 7. | Other raw materials can include feldspar, ball clay, glass, bone ash, steatite, quartz, petuntse and alabaster.
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| 8. | Calcium phosphate is one of the main combustion products of bone ( see bone ash ).
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| 9. | Furthermore, the preparation of silverpoint supports, usually with hide glue with finely ground bone ash, was labor-intensive.
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| 10. | The opacifiers can be e . g . bone ash, or tin dioxide and arsenic and antimony compounds.
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