Water soluble filter dyes are used in color negative paper in order to improve photographic sharpness. Several characteristics are required to perform this task. One of these important features is that the filter dyes have to absorb radiation in the region of the spectrum where the sensitized dye absorbs right. Second one is that the filter dyes must be decolored rapidly during processing. In order to meet these requirements, pyrazoloneoxonol dyes have been used as the filter dyes in color negative paper. These dyes are attacked by nucleophiles and are decolored. In this paper, I would like to show the relationship between the substituent's σ p values and wavelength, decoloring time of the filter dyes. I also show new oxonol dyes for photographic materials bliefly.