Good morning/night :>
You already saw this colour previously, hope you liked the way I like it.
Since I'm in love with all strange polishes, I try to collect them - and wear them
:¬D
After buying n. 75, I was curious to see what's the difference between it and "Peacock Feathers", who has the same oil-slick finish, so I put two coats of each on my trusty plastic cap and got this:

I'm glad they're not close: even if their colour structure is the same - blue/teal base full of duochrome shimmer - final result is different; "Peacock Feathers" is darker and definitely blue/purple, while n. 75 is somewhat between a lavender and purple.
Then, I saw another ANCIENT polish of mine - I bought it years and years ago - by Rimmel, which is called "Zeitgeist" ("the spirit of the age", in German), and appeared very similar to n. 75, they both have a rainbow in the bottle :>
So I put one coat of "Zeitgeist" on the white cap and here you can see the result:

That old Rimmel polish was meant to be perfectly opaque with one coat, and so it is still today - maybe it tickened a tad more with age (ok, it was like GLUE), but I have thinned it a little, so I don't care -, but I discovered it isn't a dupe for n. 75, as it's more rusty/copperish.
However, being a duochrome, it changes colour with angle, so next pics show you all the variations you can see, and you'll notice all three polishes are well distinguishable from each other!

Different greens, and different purples.

How could you not love them?
Last pic shows better the opacity of all polishes: while you can spot the blue base in "Peacock Feathers" and n. 75, "Zeitgeist" is dense and creamy.
Rimmel bottle is just 8 ml, but it's so covering you need just one coat.
I googled it, and found it's still available - even in the new design -, don't know where though, but you can find some swatches
here and
there (this particular swatch is pretty recent too).
Have a nice day/night/whatever and thanks for your attention
;¬)