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In this article we report studies on the stability of Photofrin-II and Photosan-3 by inducing porphyrin disaggregation and monitoring changes in the UV/Vis absorption and fluorescence spectra. It was observed that the aggregates in Photosan-3 are more stable than those in Photofrin-II, which may be due to a higher protoporphyrin content in Photosan-3. We also present scanning electron microscopy...