Photochromism does not have a rigorous definition, but is usually used to describe compounds that undergo a reversible photochemical reaction where an absorption band in the visible part of the electromagnetic spectrum changes dramatically in strength or wavelength.
In many cases, an absorbance band is present in only one form.
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The more dilute the pigment, the less dramatic the color change. Since 2001 she has been a Goodwill Ambassador of UNHCR.