There you go!
I have to fight the pack rat thing. It was bad for my pack rat-ness that I recently used my 100g stand again that I had in the garage at my old place for almost 17 years.
Grant, maybe the black versus white eggcrate thing is like offwhite PVC and black ABS? Different materials. Though the white eggcrate doesn't feel like PVC.
I did some googling and found claims that black eggcrate is made from black styrene. Styrene is what the white eggcrate feels like too, and white styrene is available, so I'm guessing both white and black eggcrate are made from styrene. Thus probably same material, just dyed. And as you point out, perhaps the dye is the issue, if there is one?
BRS claims that with black eggcrate, the "All black color is less likely to attract plague algae growth". It doesn't talk about not causing / not fueling algae, just not attracting algae.