THE NEATHBOW

 is considered a Colour Curiosity item.

Item description
"A book for children. One page is devoted to each of the colours of the Neath, which are not found on the Surface."

''Game note: Return to the Curator with each of the seven impossible colours in hand. The book's pages give you clues, but you'll need to seek far ports. ''

Obtaining
 can be obtained in the following ways:

Usage
 has the following uses:
 * Once you acquire all the colour pages, you can deliver the completed  to the The First Curator to receive a reward by doing the Receive a final reward action.