If rainbows came in cocktail form, it would look a little something like this.

UV Spectrum
1 ½ parts UV Blue
1 part cranberry juice
1 part pineapple juice
1/2 part grenadine
Squeeze fresh lime juice

In a high ball glass filled with ice, pour cranberry juice and grenadine. Then add pineapple juice then pour in UV Blue. Top with a squeeze of fresh lime juice.