ALUM ROCHE
\ˈaləm ɹˈɒt͡ʃ], \ˈaləm ɹˈɒtʃ], \ˈa_l_ə_m ɹ_ˈɒ_tʃ]\
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So called from Roccha in Syria, where there was a manufactory of it. It is in pieces of the size of an almond, covered with a reddish efflorescence. Common Roche Alum, A. Rochi Gallis. Fragments of common alum moistened and shaken with prepared bole. It is white when broken.
By Robley Dunglison
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