Artisan Water Mixable Oil Colour has been specifically developed to appear and work just like conventional oil colour. The key difference between Artisan and conventional oils is its ability to thin and clean up with water. Hazardous solvents are not necessary for Artisan and artists can enjoy a safer painting environment, making it ideal for artists who share a work space, schools or painting at home. Artisan has the short buttery consistency expected from a Winsor & Newton oil colour, a consistency that is a careful balance between the pigment and the oils used in the formulation (modified linseed and safflower). This is the traditional consistency of oil colours, and as such allows the artist a broader variety of techniques, the colour can be thinned as required. 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.