Patterns of reticulated film that caused by treatment with thiocyanate salts were observed with an interference microscope by reflected light. The results obtained were as follows: 1) The typical pattern of reticulated film was a net-work or was a scattered leaves-like figure, depending on procedure. 2) Production of reticulation was affected by nature of photographic gelatin. 3) A cross-section of the reticulated film looked like an eaves gutter, which was very shallow. 4) The developed silver particles were aggregated on the edge of the gutter.