As promised ladies, here is Ozotic 621. This is the scattered red holographic.
This polish is a much bluer red, and certainly more of a true red compared to 518. But it's holographic effect is very scattered and difficult to catch with the camera. In fact it's also a little difficult to catch with the eye. It certainly is very pretty and sparkly, but as far as the holographic rainbow goes, it gets a little lost within the deepness of the red jelly base.
This was three coats, because I noticed a bald spot which only had the jelly base colour and no sparkly bits on it. No top coat.
And just for you Claire - here is a side by side comparison of 521 with 518.
As you can see, 518 (on the left) is more of a strawberry pink red. 521 is a richer squishier red jelly. I personally think the holo effect in 518 can't be beat because you can actually see the rainbow effect.
Sorry Claire, I think you need both in your collection, but not until No buy July is over :)