After posting this swatch of Glitter Gal 10 to Midnight, Kim had asked me if there's any difference between the latter and Revvvolution, a well-known holographic polish from Color Club. I must admit that I had not even thought if Color Club Revvvolution would be a possible dupe before purchasing 10 to Midnight. Other than wanting to try out Glitter Gal, I was really smitten by the images I had seen of it, so it was more of a "I want it and I'm getting it" decision. Anyway, here is a late response to Kim's question, for which I apologize.
From the bottles, you can see a difference in the "holographicness". CCR is more of a scattered holo while GG10 is more linear holo. If you ask what "linear holo" means, well it refers to the rainbow effect that forms on your nails. If you are curious about how holo polishes work, you can read this post here. It will all make sense.
I painted CCR and GG10 on alternate fingers. Index-CCR, middle-GG10, ring-CCR and pinkie-GG10.
Can you see the difference? The holographic effect is much stronger for GG10. CCR's holo particles are scattered and therefore, the light reflection scatters everywhere as well and does not create the rainbow pattern. GG10's holo particles are more densely packed and so, the light goes through the light spectrum in a line and you get the linear rainbow effect.
See why I literally swooned looking at Glitter Gal 10 to Midnight? The rainbow colours in the bottle had me at Hello!
Hope you enjoyed the comparison.