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English: From left to right, aqueous solutions of: cobalt(II) nitrate, Co(NO3)2 (red); potassium dichromate, K2Cr2O7 (orange); potassium chromate, K2CrO4 (yellow); nickel(II) chloride, NiCl2 (green); copper(II) sulfate, CuSO4 (blue); potassium permanganate, KMnO4 (violet).
Français : De gauche à droite, des solutions aqueuses de : nitrate de cobalt(II), Co(NO3)2 (rouge); dichromate de potassium, K2Cr2O7 (orange); chromate de potassium, K2CrO4 (jaune); chlorure de nickel(II), NiCl2 (vert); sulfate de cuivre(II), CuSO4 (bleu); permanganate de potassium, KMnO4 (violet).


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