Elevation Polish Darkest Storm is a dark royal blue shimmer with a linear holographic effect. It's not the strongest holo, but it's still quite stunning. I cannot really comment on formula because I actually own a prototype version of the polish which was made with traditional polish base. The version of Darkest Storm sold on Elevation's website is water-based and may therefore apply differently than mine.
Indoors in low light, with flash
Outdoors on a cloudy day (pinky looked weird, so I cropped it out)
Elevation is one of my favorite brands and I highly recommend checking them out! Darkest Storm costs $12.50 and is restocked at the Elevation Polish online store on the 7th and 22nd of each month. To stay up-to-date on the latest news from Elevation Polish, follow the brand's blog.
Product purchased by me.