The Keto-enol transformation is occuring in photochromic compound.
The keto-enol transformation is an equilibrium...if this is happening, the answer is yes..
See synthesis of drugs in www.drugsyn.org
Photochromism itself means a reversible change. If it do not then the term photochromism is not suitable for this process.
Then the change is due to chemical transformation. Say Phenophthalene colourless to pink in NaOH.
Regards,
Rajesh
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