Mine I cured in a tub without light lost all their color/coralline except for a few specks here and there. I was told that’s normal.Is it normal for the colors on the rocks to fade? They lost a lot of the orange and a little of the purple. They've been curing in a black plastic bin with a pump and heater for 6 days now. I've been doing wc every other day. It's hard to maintain temp outside but it's usually between 77-80 and sometimes to 82 when I'm not able to check on them. They're covered so they don't get much light. Trying to prevent algae growing. They probably won't go in the tank for at least another week or 2.
The rock I put directly in my display has held its color and coralline so far.