Bolus Clay
Armenian bole, also known as bolus armenus or bole armoniac, is an earthy clay, usually red, native to Armenia but also found in other places. The term Armenian was later referred to a specific quality of the clay. Originally used in medication, it has also been used as a pigment, as a poliment or base for gilding, and for other uses. It is red due to the presence of iron oxide; the clay also contains hydrous silicates of aluminum and possibly magnesium. Uses Historically, the term bolu or bolus was used only for medicinal earths and Armenian bole was used as an astringent, prescribed against diarrhea, dysentery, and bleeding. References to Armenian bole were made by Theophrastus, Pedanius Dioscorides, Dioscorides (c. 41–90 AD) and Pliny the Elder (23–79 AD). Externally, it was used in strengthening plasters, against dislocations of the joints. Physicians sometimes also called it ''Rubrica Synopica'', from the city of Sinop, Turkey, Synope, where it is supposed to be found. Use ...
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