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Main provisions of the crystals theory:
Practical techniques:
Copper(II) sulfateCopper(II) sulfate, Andrey ZmitrovichAndrey ZmitrovichVKontakte
Iron(II)-ammonium sulfateIron(II)-ammonium sulfate, Stanislav PopovStanislav PopovZircon81.narod.ru site
Chromium(III)-potassium ыulfateChromium(III)-potassium ыulfate, Maxim SkokovMaxim SkokovVKontakte
Sodium chlorideSodium chloride, Aleksandr ChernikhAleksandr ChernikhVKontakte