English: Flat crystals obtained by spreading and drying of a drop (50 microliter) of an aqueous solution of 6% copper(II) chloride + 4% trehalose on an hydrophilic microscope object carrier. Grey values are shown with colors. Details can be found in the books by M. Markus „Bildkraft der Substanzen“ (Arnshaugk Verlag, Neustadt an der Orla, 2017) and „Scientia et Ars“ (Ediciones UC, Chile, 2019)
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