We have recently reported on photochromic PS polymers using newly developed diaryl-HI photoswitches (Figure ) as the light-active component. We could demonstrate that their photochromism generating reversible E/Z photoisomerization can be retained in the solid material through different external stimuli such as light and acid, giving rise to marked contrast changes between red and purple (Figure ). To evaluate the robustness of HIs in different polymers as well as to generally broaden applicability of HIs in polymer applications, we now combined their pronounced photochromism with the photoinitiator functions of aza- diarylethene 9. At the first level we introduced the series of HIs 1-7 (Figure ) into PMA, which was separately photopolymerized by aza-diarylethene 9 before. To this end the photoinitiated polymerized PMA was diluted in CH2Cl2, mixed with HIs 1-7, and subsequently the solvent was evaporated, leading to highly colored and transparent photochromic materials.