Prussian Blue is a deep blue colour. It was made by German chemist Diesbach around 1704 making it the first synthetic blue pigment. It quickly gained favour as an alternative to genuine Ultramarine.
Our popular Cotman Watercolours come in 48 colours. They are made with fine art pigments so are uncompromising on quality with good tinting strength. Available individually or in a variety of sets for all needs.