This was the "it" color on MUA a couple of years ago. I remember trying to hunt this puppy down at the time, it was not easy to find ☺
Opulent Cloud is a nice purple-y silver base with a tan flash. I think the purple shows mostly in the bottle, on the nail, it's primarily silver.
Then I decided to try out another Kleancolor crackle, #240 Blue. This one kind of buckled again. I think maybe I didn't wait long enough for the base color to dry or it was the humidity. The Kleancolor crackles seem to be pretty finicky....it does show promise though. I like the contrast of the blue and silver.
Thanks for looking!