Pthallo=Phthalo

Pthallo is derived from the artists colour phthalo blue.
Phthalocyanine Blue BN, also called phthalo blue, helio blue, thalo blue, Winsor blue, phthalocyanine blue, C.I. Pigment Blue 15:2, Copper phthalocyanine blue, Copper tetrabenzoporphyrazine, Cu-Phthaloblue, PB-15, PB-36, and C.I. 74160, is a bright, greenish-blue crystalline synthetic blue pigment from the group of phthalocyanine dyes.
A common component on the artist's palette, Phthalo Blue is a cool blue with a bias towards green. It has intense tinting strength and easily overpowers the mix when combined with other colors. It is a transparent staining color and can be applied using glazing techniques.