Читать книгу The Preservation of Antiquities: A Handbook for Curators - Friedrich Rathgen - Страница 6
Оглавление“Wherever one digs one finds brackish water containing soda, sea-salt, and a small quantity of saltpetre. Indeed, when a garden has been flooded for irrigation purposes, crystals of salt make their appearance on the surface after the water has evaporated or has been soaked up by the soil.”
In the dry climate of Egypt, objects saturated with salt keep better after their removal from the ground than in our climate, where the variations in the temperature and in the hygroscopic condition of the air produce a partial deliquescence in wet weather, and in dry weather a re-formation of crystals. The continued alternation of these processes gradually loosens the surface of limestone or earthenware, or induces certain chemical changes in objects of metal and in both cases leads to their destruction.
