| Four of the oldest monasteries in the world still survive in the natron Valley. |
| Behind her, in baskets were ivory tusks, gold, blocks of incense, natron salts and uncut precious stones. |
| Once, while staying with Kondratiev at Nizy, the local doctor had recommended him natron water. |
| Gradually the yellow skin preserved by the natron began to appear through the cross-hatchings of the bandages. |
| For weeks it was soaked in a solution of natron and then it was filled with pitch. |
| In alkaline lakes, natron and trona are found in the United States, Africa, and South America. |
