One might simply call Phthalo Green dark cyan. This corresponds to a large extent to the color of Viridian, however, Phthalo Green is darker and purer, and can be more bluish in tone. Phthalo Green mixed with white is more brilliant than Viridian.
Chemical description: Copper-phtalocyanine halogenated.C.I. Pigment Green 7
Colour Index: PG 7.74260
Suitability: Oil, Acrylics, Tempera, Watercolor / Gouache, Lime / Fresco, Cement / Tadelakt
Lightfastness: Concentrated: 8, Medium: 8, Thinned: 8 (1 is poor, 8 is best).
Resistance: Acid: 5, Alkali: 5, Lime: 5 (1 is poor, 5 is best).
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