I dug out my Maxfactor Fantasy Fire and layered it over Essie's Aruba which is a stunning deep blue colour.
As most of you have probably seen, Fantasy Fire is a stunning multicoloured polish. Many have been comparing it to Clarins 230 polish, I haven't tried this so can't say for myself how closely related they are. However, from other people's images the two polishes do look like a very close match.
Fantasy Fire itself is very sheer, I have tried it by itself before, but even four coats didn't look great to me. I think this polish is best as a layered. Here I put two coats of it over one coat of Essie's Aruba blue.
I have seen people layer this over black which also looks stunning.