Processes of dissolution of developed silver particles and of silver halide macrocrystals by the treatment with thiocyanate salt solution were studied. The dissolution of the developed silver particles increased with raising concentration and temperature of thiocyanate fixing solutions. The reducing ratio of the photographic density of a film treated in 24 hours and that treated in ten minutes was 1: 2 in the case of 2N thiocyanate solution of 20°C. The reducing effect was larger in acid side (pH 3) than in alkali side (pH 8). Crystals of silver thiocyanate were deposited on the surface of silver halide macrocrystals during the first stage of fixing process. These crystal forms differed according to the kinds of anion such as NH₄⁺, Li⁺, and Mg⁺⁺. Growth direction of the silver thiocyanate crystals were in parallel with the edges of the triangular or hexagonal silver halide macrocrystals.