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Main provisions of the crystals theory:
Practical techniques:
Copper(II) sulfateCopper(II) sulfate, Artem PavlukovArtem PavlukovVKontakte
Citric acidCitric acid, Viktoriya ShipovaViktoriya ShipovaVKontakte
Iron(II) sulfateIron(II) sulfate, Artem PavlukovArtem PavlukovVKontakte
Iron(II)-ammonium sulfateIron(II)-ammonium sulfate, Inna MudrikInna MudrikVKontakte