Artisan Water Mixable Oil Color has been specifically developed to appear and work just like conventional oil color. 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. Like traditional oil color, Artisan Water Mixable Oil Color is made from linseed oil and safflower oil but the difference is the linseed oil and safflower oil used in Artisan have been modified so that they will mix and clean up with water. Sap Green Permanent is a rich mid-range green with a yellow undertone. Originally Sap Green was a lake pigment made from unripe Buckthorn berries.