Haw. Rev. Stat. § 5-16.5: Official island colors.

The color red is established and designated as the official color of the island of Hawai`i.

The color pink is established and designated as the official color of the island of Maui.

The color golden yellow is established and designated as the official color of the island of O`ahu.

The color purple is established and designated as the official color of the island of Kaua`i.

The color green is established and designated as the official color of the island of Moloka`i.

The color orange is established and designated as the official color of the island of Lāna`i.

The color white is established and designated as the official color of the island of Ni`ihau.

The color gray is established and designated as the official color of the island of Kaho`olawe.