20th-Century Blue Also Called Winsor Blue

This page is the CodyCross answer for the clue below from Deserts of the world, Group 1609, Puzzle 4 (Arches National Park).

Question is: 20th-Century Blue Also Called Winsor Blue

and the answer is: PHTHALO

Word Meaning:

PHTHALO — A phthalocyanine.

Definitions from Wiktionary.