Nostalgia (H) is a very shifty "ultrachrome" (that's shiftier than your run of the mill duochrome lol) with a linear holo. The colour spectrum shifts from forest green to grass green to gold to orangey-red to a plumy-maroon. Or at least that's what I see! I always like my duochromes over black (I really don't know if it makes a difference, but I feel like it makes the colours a touch brighter) so this is two coats over OPI Black Onyx plus top coat (because it was a little brush-strokey and I thought the top coat might hide it and it did to some degree)
Hope you guys like my swatches and have an awesome day! See ya tomorrow!