This paper presents a study of the hydrolytic stability of high contrast polyvinyl alcohol-iodine type polarizers. The central topic is the relationship between visible light transmission, polarization efficiency and their effect on hydrolytic stability. The format includes a series of graphs, illustrating first the dependence of polarization efficiency on visible light transmission. The spectral distribution of transmitted light before and after hydrolytic stability conditioning is also discussed. Of particular interest is the transmission dependence of hydrolytic stability. This is first presented as the rate of degradation in polarization efficiency as a function of conditioning time for selected transmissions. This data is then presented in a more condensed form. These graphs will illustrate the time required for polarization efficiency degradation to 90% of initial efficiency as a function of visible light transmission and temperature. A new generation of American Hoechst Corporation Film Division polarizers exhibit improved hydrolytic stability. Their performance will be compared with other polyvinyl alcohol-iodine liquid crystal display polarizers.