I don’t know if any of you are aware of this, but Kodak in it’s time in business actually produced CD-R’s using two types of dye.
CD-R Identifier recognises the two types of dyes as:
The transparent dye: Phthalocyanine [Type 5]
The green dye: Phthalocyanine [Type 7]
Kodak’s Type 5 dye is, or was, Kodak’s newest dye and is NOT related to Formazan. It is similar to Mitsui’s dye and is used in Kodak Gold and Kodak Silver+Gold discs. It is almost transparent in colour (actually a light green).
Kodak’s Type 7 was Kodak’s original Formazan dye. It is blue-green in colour but combined with a gold reflective layer, looks deep green, almost like a Gold/Green Cyanine CD-R. It was used in all Kodak Digital Science CD-R’s (AFAIK) and all Kodak Digital Audio CD-R’s.