Viscosities, jelly strengths, setting points, and swellings of gelatin and polyvinyl alcohol were effected with thiocyanate salts and/or sulfate salts. Viscosity of 6²/₃% hide gelatin solution decreased about 10% by adding ammonium thiocyanate and potassium one. but increased about 10% by adding sodium thiocyanate, lithium one, and magnesium one. Viscosities of 7% polyvinyl alcohol solution decreased 15%, 20%, 25% by adding potassium thiocyanate, sodium one, and a ammonium one in the concentrations of 1.0 to 1.5 M, but increased by adding magnesium thiocyanate, In the case of adding sulfates, viscosities of gelatin were in the order of NH₄⁺++++++, and those of polyvinyl alcohol were in the order of NH₄⁺+++. Jelly strength and setting point of 6²/₃% hide gelatin solution reduced to a half when 0.5 M thiocyanate were added, and those of gelatin incerased to 20-30 percent when organic acid salts were added. Thickness of swelled X-ray film processed by thiocyanate salt solution was 20-30 times (to 600-1200μin thickness) that of original film and in the case of polyvinyl alcohol emulsion it swelled 6-7 times (to 160-200μ in thickness). The swelling is suppressed by the addition of sodium sulfate, magnesium sulfate, and aldehyde and the order of suppression for gelatin was sodium, aldehyde, magnesium. That for polyvinyl alcohol was reverse.