Arctic Fox Semi-Permanent Poseidon Hair Dye Poseidon is the god of the sea, so it's no wonder this hair color is named after him. This vibrant blue from Arctic Fox is an essential color in any mermaid ombre. Arctic Fox hair color is a cruelty-free, semi-permanent hair dye that is made only from vegan ingredients. Plus, there is added conditioner that makes your hair feel soft and smooth!