This is a red crackle I bought at Auryn, which is still available at the Enchantra webshop.
I used a topcoat, because in reality, the polish looks like this when dried:
This is when I tried it out on ome fingers, if you like the matte look, you don't need a topcoat, but it was a bit to light more orange toned to my taste without it.
I first applied Collistar's, Nero Lurex, a great polish with lots and lots of holographic shimmer.
Then I applied the red crackle, and when it was dried, a clear topcoat by INM.
This polish costs 6,95 euros for which you get 17 ml.