Figure 1. Spiropyran crystals under a light microscope. Top left, 50x magnification after crystallization, top right 150x magnification. Bottom left at 200x magnification after a few hours under daylight, bottom right at 100x magnification. The reddish color (top) gives way to a yellow-golden color (bottom) [15]

From

Experimental Approach for Efficiency Determination of Photocatalytic Hydrogen Evolution

Philipp Lanfermann, Christoph Weidmann, Janina Dege, Steven Celik, Alexander Tasch, Mona Christin Maaß, Thomas Waitz

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