"Yield color"..?

[ That's. A very intriguing way to put it. They had to give up their ability to see it in all but-- "sepia", she assumes, is alike to the varying levels of "brightness" she sees now. That people could "buy" it back was... despicable, but made it all the more desirable. ]

I'm sure even "white" seemed a novelty for you after that, nevermind all the shades-- the hues you've been able to see here. How "resplendent" your wings were in the mirror.

[ Is it any wonder he adored them? No, of course not, even if to her they had been a smattering of darks and lights. ]

... On my end, we aren't sure why colors no longer exist. [ A beat, then slower. ] Or rather, we hadn't an idea until recently, due to some... circumstances which illuminated the "how", even if the "why" would still be forever unknown. They are there, but I nor the others can see them -- alike to yours, it sounds, though less "voluntary".

[ loosest "voluntary" in the world, but. it is a choice people make. ]

We use "darkless", "bright", "dark", "lightless", to broadly describe things. You can guess what they may correlate to in your vocabulary.