The full name of this colour is Phthalocyanine blue, though it is usually shortened to phthalo blue and is sometimes called thalo blue. This modern organic pigment was invented in 1928 and because it is outstanding in all its properties it rapidly became an indispensable colour. Its colour is a full, intense greenish-blue. Sometimes called cyan blue, it is used in three colour process work. Its tint strength is very high to the point of being overwhelming to work with at times. In mass tone this pigment bronzes, which means that it gives the illusion of being a shimmery reddish blue. Phthalo blue and Phthalo green blended together make a clean, beautiful turquoise.