Pretty unlikely that the treated hair issue can be tackled "head-on" - Bleach (also used with dyes), well, bleaches the hairs' markers, no?
That said - huge swaths of the world's population does not bleach/dye frequently, especially downstairs.
Current trials are being done with the non-dyers of this world. And it's a pretty straight-forward affair.
Even the highs of 2.00+ were undervaluing this one.
