There are two different Blu-ray dye technologies, LTH and HTL. HTL is the original and uses more expensive inorganic materials (germanium, bismuth, or palladium) and then there's the cheaper LTH that came later and uses an organic dye that's more susceptible to light, breaks down rather quickly over time, and has more burning/reading issues. You don't want to use the latter.

Typically if the surface of the disc is gold and darkens with writing, it's an LTH disc.