Sorry to reply late, but perhaps to the benefit of others....
Our testing of accelerated aging (twice in a humidity test chamber) along with UV exposure to natural UV light for 2 weeks revealed the following:
Longer bars mean better quality. This is a summary score for the three aging tests scores.
As you can see, the discs are quite old and there are no guarantees that the discs with same ID codes are still same quality today.
What we did notice however, is that TY 16x was not up to snuff, neither was Verbatim 16x. These were all genuine authentic discs (except for the Gigatain TY fake, which was tested as an example of fake quality).
Now what conclusions can we draw from these for todays' discs?
Very little, I'm afraid.
We do not have exact information on dyes used and factories that made the discs (or even the country of origin for all discs).
Also, manufacturers tweak their formulations and things change a lot in two years.
What is obvious however is that the gold archival MAM-A discs do last long, even if their initial error counts are not as low as for other brands. However, they stay practically unchanged throughout the whole test.
Another thing that is obvious and probably holds for discs of today as well is that 4x is better than 8x is better than 16x.
And I don't necessarily only mean the speed grading, but the actual burn speed. So, it really does pay to wait in this case. 4x does last longer on the average.
What would I buy today?
I might try the Verbatim UltraLife archival grade gold, which seems to be decently priced for an archival grade disc. However, I have NOT tested it, nor seen good stress tests by any third party.
The other alternative is the MAM-A gold archival discs.
All other options (Delkin, Imation, Kodak, etc) are way too overpriced and propably made by MAM-A or Prodisc anyway.
As for BD, I'm not holding my breath. The drives are slow, discs hugely expensive and it'll take quite a long time till these babies take off in volume. I'm expecting 2-4 years minimum. And we have absolutely no idea how they age (never trust mfg data on this, they've been shown to be so misleading/wrong so many times, it's not even funny anymore).