M. Graham Oil Color We set out to make a paint Da Vinci would use. This is it. Why Walnut Oil? In the tradition of the masters, M. Graham artists' oil color is made with pure walnut oil for its brilliance, clarity, texture, and resistance to fading and yellowing. Working in small batches, we craft oil colors true to the roots of Renaissance painting: delicately free-flowing, solvent-free, and with no fillers or additives. With the exceptionally high pigment loads in M. Graham artists' oil colors, your work will naturally feel more alive and vibrant, imbued with rich, lustrous color for years to come.