So in honour of that, I pulled out one of my own bottles and made this NOTD.
With the right lighting the flakes change colours, the bottom is what they look indoors, the top is what they look like in daylight.
The flakes' colours runs from yellow, gold, orange, red to green and blue.
This Golden Rose polish is mostly orange/red and blue indoors. It almost gives the black a blueish shine to it.
But outdoors with the right daylight, or indoors with bright light, it turns into all the colours of the rainbow.