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Main provisions of the crystals theory:
Practical techniques:
Copper(II) sulfateCopper(II) sulfate, Artem PavlukovArtem PavlukovVKontakte
Aluminum-potassium sulfateAluminum-potassium sulfate, Stanislav PopovStanislav PopovVKontakte
Magnesium sulfateMagnesium sulfate, Crystalchase21Crystalchase21Crystalverse.com
Sodium chlorideSodium chloride, Aleksandr ChernikhAleksandr ChernikhVKontakte