Secret Passage is a magenta base loaded with pink mirror flakes that have a slight shift from pink to gold in certain lighting.
Other colors included in the Phantasmagoria Collection are:
Magic Lantern - reflective glitter topper with a strong blue/indigo/violet shimmer
Fantoscope - gunmetal polish facing forward with a surprise shift to red and a turquoise due to the black to red flakes and silver to turquoise flakes and pigment
Phantasmagoria - black jelly base with purple/magenta/orange shifting shimmer and silver to turquoise shifting mirror flakes
Phantom - teal jelly base with black flakes and multiple colorways of shifty iridescent flakes
Thank you to @amazon_queen82, @bentminddesigns, @nailbastion, @michellebeahnrose, @priscilla_in_graceland, @velvetmarmoset for the beautiful swatches!