What is phtalo blue?

Phthalo blue is a bright, intense blue color that is commonly used in art materials such as paint and ink. It is derived from phthalocyanine, a synthetic organic pigment first developed in the 1930s. Phthalo blue is one of the most popular and versatile blues due to its strong tinting strength and ability to mix well with other colors. It is also known for its lightfastness, meaning it resists fading over time when exposed to light. Phthalo blue is commonly used in landscape and seascape paintings, as well as for creating vibrant abstract works of art.