Chalybeate (from Chalybes, a Scythian people, S. and S. E. of the Black sea, who worked in iron, whence Gr. steel), a name now applied to waters and medicines which contain iron. It generally exists in them in the state of the carbonate of the protoxide, which is soluble so long as an excess of carbonic acid gas is present; as this is given off, the protoxide absorbs oxygen, and is converted into an insoluble hydrated sesquioxide, which falls down as a yellow ochreous powder. Chalybeate waters possess a styptic taste, and give the characteristic reactions indicative of the presence of iron by the addition of nutgalls and of ferrocyanuret of potassium. In this country springs that might claim this name are very common. The most important of them are those of Bedford and Brandy wine in Pennsylvania. Arsenic and copper are found in Europe in the sediment of chalybeate springs. They appear to do no harm, on account of the antidotal properties of the oxide of iron.