I see similar effects with some of my surviving acros. In treating for AEFW, all my acros went into QT under less than ideal conditions, and after repeated nuclear strength dips, the ones that didn't totally die, were all brown. As they came back, many of them went green(never green before this). I am still waiting for some of them to come back around, but it's been months. The new growth areas seem to color much better.