POTASSIUM AND AMMONIUM TARTRATE
\pətˈasi͡əm and amˈə͡ʊni͡əm tˈɑːtɹe͡ɪt], \pətˈasiəm and amˈəʊniəm tˈɑːtɹeɪt], \p_ə_t_ˈa_s_iə_m a_n_d a_m_ˈəʊ_n_iə_m t_ˈɑː_t_ɹ_eɪ_t]\
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A substance, KNH4C4H4O6, occurring as transparent prismatic crystals of pungent and saline but cooling taste, becoming opaque in the air, and easily soluble in water, potassium and copper carbonate. A substance obtained by dissolving recently precipitated copper carbonate in a solution of potassium carbonate; used as a test, as it is reduced by glucose and milk sugar, but not by cane sugar, dextrin, or soluble starch.
By Smith Ely Jelliffe
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