Cyanine dye CD-Rs were the earliest ones developed, and their formulation is patented by Taiyo Yuden.
From the en.wikipedia.org
The sculpture consists of 14 glass spheres that focus the Sun's rays into hollow bronze shells, each of which is lined with gold covered by a photosensitive layer of blue cyanine dye.
From the newscientist.com
Unlike cyanine, phthalocyanine is more resistant to UV rays and CD-Rs based on this dye show signs of degradation only after two weeks of direct sunlight exposure.