| 1. | Historic activities are a major part of the Saltpetre Cave tour.
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| 2. | It also has saltpetre, gunpowder, and lead-smelting works.
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| 3. | At the same time mining activity in Chile reoriented to saltpetre operations.
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| 4. | This was used to bring in sulphur and saltpetre, the other ingredients.
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| 5. | For the preparation of saltpetre, Song Yingxing wrote:
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| 6. | The reaction was between melted saltpetre and acetic acid which produced a red vapor.
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| 7. | At the same time their saltpetre trade was disrupted by another rival British company.
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| 8. | Old recipes use saltpetre which is not recommended.
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| 9. | This resulted in an improved method of extracting saltpetre and consequently higher quality gunpowder.
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| 10. | Also near Ashurst are the earthwork remains of a 16th-century saltpetre house.
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मोबाइल