PENZOLDT ACETONE REACTION
\pˈɛnzə͡ʊldt ˈasɪtˌə͡ʊn ɹɪˈakʃən], \pˈɛnzəʊldt ˈasɪtˌəʊn ɹɪˈakʃən], \p_ˈɛ_n_z_əʊ_l_d_t ˈa_s_ɪ_t_ˌəʊ_n ɹ_ɪ__ˈa_k_ʃ_ə_n]\
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A saturated solution of orthonitrobenzaldehyd, when treated with a solution and then with caustic soda, turns yellow, then green, and finally blue. The indigo blue which is formed is made more apparent by shaking with chloroform, in which it is soluble.
By Smith Ely Jelliffe
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