Quark recently modified its Dyed Elytras to be lighter in tone in version [Quark-r1.5-134] for 1.12.2. (See change here) Because of this, the colors of dyed Elytras in this mod no longer match to them. A small change needed to fix this?

Quark Pink Dyed Elytra

Colytra Pink Dyed Elytra bauble

Thanks for bringing this to my attention. Should be an easy fix, I'll try and push out an update as soon as I can.