The color changes depending on the angle you see.
When you write on white and black paper it changes the way you see it.
The vibrant colors of the ink are combined with "ink" (dye) and "lamé" (lamé pigment) to allow you to see two different colors simultaneously, giving you an unprecedented glitter.

Ink Color:
Green + metallic blue
Pink + metallic pink
Blue + metallic green
Violet + metallic blue