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