M. Graham & Co's Zinc White oil paint is PW4 pigment and walnut oil. Lightfast Rating - Excellent Opacity Rating - Semi Opaque Drying Time - Slow Zinc White is a semi-opaque tinting and scumbling white. Produces cool tints with excellent resistance to yellowing. 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, they 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.