Chromium

(krof -nie-um) \_xpidua, color]. Cr= 52.2; quantivalence II and iv. One of the elements of the iron-group. The various salts of chromium, especially the derivatives of C. trioxid or chromic acid, Cr203, are much used in the manufacture of pigments and as a caustic. All are poisonous. Pota ium dichromate (bichromate of potash), K2Cr207, is used as a caustic, ant emetic, and alterative; as a preserving agent for animal ti ues, as a reagent, and in battery-fluids. 192