Photosensitive gelatin.

@article{Vesperinas2006PhotosensitiveG,
  title={Photosensitive gelatin.},
  author={Ana Vesperinas and Julian Eastoe and Paul Wyatt and Isabelle Grillo and Richard K Heenan},
  journal={Chemical communications},
  year={2006},
  volume={42},
  pages={
          4407-9
        }
}
Employing photodestructible surfactants in gelatin-based aqueous gels presents novel possibilities for controlling colloidal and aggregation properties of surfactant gelatin complexes. Light-triggered breakdown of the gelatin-bound photosurfactant aggregates causes dramatic changes in viscosity and aggregation. 
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